feat: add SQL migration for remote connection metadata (#22237)

sqlite/migrations/0003_create_remotes_table.sql

@@ -0,0 +1,21 @@
+-- The user_version should match the "000X" from the file name
+-- Ex: 0001_create_notebooks_table should have a user_verison of 1
+PRAGMA user_version=3;
+
+CREATE TABLE remotes (
+    id VARCHAR(16) NOT NULL PRIMARY KEY,
+    org_id VARCHAR(16) NOT NULL,
+    name TEXT NOT NULL,
+    description TEXT,
+    remote_url TEXT NOT NULL,
+    remote_api_token TEXT NOT NULL,
+    remote_org_id VARCHAR(16) NOT NULL,
+    allow_insecure_tls BOOLEAN NOT NULL,
+    created_at TIMESTAMP NOT NULL,
+    updated_at TIMESTAMP NOT NULL,
+
+    CONSTRAINT remotes_uniq_orgid_name UNIQUE (org_id, name)
+);
+
+-- Create indexes on lookup patterns we expect to be common
+CREATE INDEX idx_remote_url_per_org ON remotes (org_id, remote_url);