wasm: use Bazel rules from Proxy-Wasm Rust SDK. (#14292)

Signed-off-by: Piotr Sikora <piotrsikora@google.com>

bazel/WASM.md

@@ -3,17 +3,5 @@
 WebAssembly tests are built using [Proxy-Wasm C++ SDK] and [Proxy-Wasm Rust SDK],
 as such, they bring their own set of dependencies.
 
-## Cargo dependencies.
-
-In order to update Cargo dependencies, please make sure that Rust and Cargo
-are installed, and run this tool:
-
-```
-bash tools/update_cargo.sh
-```
-
-which will regenerate Bazel rules in `bazel/external/cargo/`.
-
-
 [Proxy-Wasm C++ SDK]: https://github.com/proxy-wasm/proxy-wasm-cpp-sdk
 [Proxy-Wasm Rust SDK]: https://github.com/proxy-wasm/proxy-wasm-rust-sdk

bazel/dependency_imports.bzl

@@ -6,14 +6,14 @@ load("@bazel_gazelle//:deps.bzl", "gazelle_dependencies", "go_repository")
 load("@build_bazel_rules_apple//apple:repositories.bzl", "apple_rules_dependencies")
 load("@upb//bazel:repository_defs.bzl", upb_bazel_version_repository = "bazel_version_repository")
 load("@io_bazel_rules_rust//rust:repositories.bzl", "rust_repositories")
-load("@io_bazel_rules_rust//:workspace.bzl", "bazel_version")
 load("@config_validation_pip3//:requirements.bzl", config_validation_pip_install = "pip_install")
 load("@configs_pip3//:requirements.bzl", configs_pip_install = "pip_install")
 load("@headersplit_pip3//:requirements.bzl", headersplit_pip_install = "pip_install")
 load("@kafka_pip3//:requirements.bzl", kafka_pip_install = "pip_install")
 load("@protodoc_pip3//:requirements.bzl", protodoc_pip_install = "pip_install")
 load("@thrift_pip3//:requirements.bzl", thrift_pip_install = "pip_install")
 load("@rules_antlr//antlr:deps.bzl", "antlr_dependencies")
+load("@proxy_wasm_rust_sdk//bazel:dependencies.bzl", "proxy_wasm_rust_sdk_dependencies")
 
 # go version for rules_go
 GO_VERSION = "1.14.7"
@@ -26,9 +26,9 @@ def envoy_dependency_imports(go_version = GO_VERSION):
     gazelle_dependencies()
     apple_rules_dependencies()
     rust_repositories()
-    bazel_version(name = "bazel_version")
     upb_bazel_version_repository(name = "upb_bazel_version")
     antlr_dependencies(472)
+    proxy_wasm_rust_sdk_dependencies()
 
     custom_exec_properties(
         name = "envoy_large_machine_exec_property",