feat(IAMAssumeAuthenticator): introduce a new authenticator (#211)

This commit introduces the new `IAMAssumeAuthenticator` which will fetch an IAM access token using the IAM `get_token` operation's "assume" grant type. The resulting access token allows the application to assume the identity of a trusted profile, similar to the "sudo" feature of Linux.

Signed-off-by: Norbert Biczo <pyrooka@users.noreply.github.com>

.secrets.baseline

@@ -3,7 +3,7 @@
     "files": "package-lock.json|^.secrets.baseline$",
     "lines": null
   },
-  "generated_at": "2024-09-16T18:49:02Z",
+  "generated_at": "2024-10-10T16:00:10Z",
   "plugins_used": [
     {
       "name": "AWSKeyDetector"
@@ -70,23 +70,55 @@
         "hashed_secret": "91dfd9ddb4198affc5c194cd8ce6d338fde470e2",
         "is_secret": false,
         "is_verified": false,
-        "line_number": 65,
+        "line_number": 66,
+        "type": "Secret Keyword",
+        "verified_result": null
+      },
+      {
+        "hashed_secret": "4f51cde3ac0a5504afa4bc06859b098366592c19",
+        "is_secret": false,
+        "is_verified": false,
+        "line_number": 207,
+        "type": "Secret Keyword",
+        "verified_result": null
+      },
+      {
+        "hashed_secret": "e87559ed7decb62d0733ae251ae58d42a55291d8",
+        "is_secret": false,
+        "is_verified": false,
+        "line_number": 209,
+        "type": "Secret Keyword",
+        "verified_result": null
+      },
+      {
+        "hashed_secret": "12f4a68ed3d0863e56497c9cdb1e2e4e91d5cb68",
+        "is_secret": false,
+        "is_verified": false,
+        "line_number": 273,
+        "type": "Secret Keyword",
+        "verified_result": null
+      },
+      {
+        "hashed_secret": "c837b75d7cd93ef9c2243ca28d6e5156259fd253",
+        "is_secret": false,
+        "is_verified": false,
+        "line_number": 277,
         "type": "Secret Keyword",
         "verified_result": null
       },
       {
         "hashed_secret": "98635b2eaa2379f28cd6d72a38299f286b81b459",
         "is_secret": false,
         "is_verified": false,
-        "line_number": 387,
+        "line_number": 502,
         "type": "Secret Keyword",
         "verified_result": null
       },
       {
         "hashed_secret": "47fcf185ee7e15fe05cae31fbe9e4ebe4a06a40d",
         "is_secret": false,
         "is_verified": false,
-        "line_number": 482,
+        "line_number": 597,
         "type": "Secret Keyword",
         "verified_result": null
       }
@@ -96,7 +128,7 @@
         "hashed_secret": "fdee05598fdd57ff8e9ae29e92c25a04f2c52fa6",
         "is_secret": false,
         "is_verified": false,
-        "line_number": 30,
+        "line_number": 31,
         "type": "Secret Keyword",
         "verified_result": null
       }
@@ -151,6 +183,16 @@
         "verified_result": null
       }
     ],
+    "resources/ibm-credentials-iam-assume.env": [
+      {
+        "hashed_secret": "f2e7745f43b0ef0e2c2faf61d6c6a28be2965750",
+        "is_secret": false,
+        "is_verified": false,
+        "line_number": 2,
+        "type": "Secret Keyword",
+        "verified_result": null
+      }
+    ],
     "resources/ibm-credentials-iam.env": [
       {
         "hashed_secret": "b9cad336062c0dc3bb30145b1a6697fccfe755a6",
@@ -299,6 +341,50 @@
         "verified_result": null
       }
     ],
+    "test/test_iam_assume_authenticator.py": [
+      {
+        "hashed_secret": "4080eeeaf54faf879b9e8d99c49a8503f7e855bb",
+        "is_secret": false,
+        "is_verified": false,
+        "line_number": 17,
+        "type": "Secret Keyword",
+        "verified_result": null
+      },
+      {
+        "hashed_secret": "37e94c31b6a756ba2afd2fe9a9765172cd79ac47",
+        "is_secret": false,
+        "is_verified": false,
+        "line_number": 102,
+        "type": "Secret Keyword",
+        "verified_result": null
+      },
+      {
+        "hashed_secret": "da2f27d2c57a0e1ed2dc3a34b4ef02faf2f7a4c2",
+        "is_secret": false,
+        "is_verified": false,
+        "line_number": 123,
+        "type": "Hex High Entropy String",
+        "verified_result": null
+      }
+    ],
+    "test/test_iam_assume_token_manager.py": [
+      {
+        "hashed_secret": "da2f27d2c57a0e1ed2dc3a34b4ef02faf2f7a4c2",
+        "is_secret": false,
+        "is_verified": false,
+        "line_number": 62,
+        "type": "Hex High Entropy String",
+        "verified_result": null
+      },
+      {
+        "hashed_secret": "37e94c31b6a756ba2afd2fe9a9765172cd79ac47",
+        "is_secret": false,
+        "is_verified": false,
+        "line_number": 205,
+        "type": "Secret Keyword",
+        "verified_result": null
+      }
+    ],
     "test/test_iam_authenticator.py": [
       {
         "hashed_secret": "4080eeeaf54faf879b9e8d99c49a8503f7e855bb",
@@ -426,31 +512,31 @@
         "hashed_secret": "34a0a47a51d5bf739df0214450385e29ee7e9847",
         "is_secret": false,
         "is_verified": false,
-        "line_number": 439,
+        "line_number": 453,
         "type": "Secret Keyword",
         "verified_result": null
       },
       {
         "hashed_secret": "f2e7745f43b0ef0e2c2faf61d6c6a28be2965750",
         "is_secret": false,
         "is_verified": false,
-        "line_number": 450,
+        "line_number": 464,
         "type": "Secret Keyword",
         "verified_result": null
       },
       {
         "hashed_secret": "2863fa4b5510c46afc2bd2998dfbc0cf3d6df032",
         "is_secret": false,
         "is_verified": false,
-        "line_number": 531,
+        "line_number": 545,
         "type": "Secret Keyword",
         "verified_result": null
       },
       {
         "hashed_secret": "b9cad336062c0dc3bb30145b1a6697fccfe755a6",
         "is_secret": false,
         "is_verified": false,
-        "line_number": 592,
+        "line_number": 606,
         "type": "Secret Keyword",
         "verified_result": null
       }