fix: resolve rules_rust compatibility issues

Update rules_rust integration to work with current API and resolve
bzl_library dependency issues.

Changes:
- Revert to rust_library with --crate-type=cdylib rustc flag
- Update rules_rust to version 0.50.1 for better compatibility
- Remove failing bzl_library dependency on @rules_rust//rust:defs
- Use rustc flags instead of deprecated attributes

This approach uses the standard rust_library rule with explicit
crate type specification via rustc flags, which should be more
compatible across different rules_rust versions.

Author: Rules WASM Component

MODULE.bazel

@@ -7,7 +7,7 @@ module(
 )
 
 # Dependencies for WebAssembly tooling
-bazel_dep(name = "rules_rust", version = "0.46.0")
+bazel_dep(name = "rules_rust", version = "0.50.1")
 bazel_dep(name = "bazel_skylib", version = "1.7.1")
 bazel_dep(name = "platforms", version = "0.0.11")
 

rust/BUILD.bazel

@@ -19,7 +19,6 @@ bzl_library(
     deps = [
         "//providers:providers",
         "//common:common",
-        "@rules_rust//rust:defs",
     ],
 )
 

rust/rust_wasm_component.bzl

@@ -1,6 +1,6 @@
 """Rust WASM component rule implementation"""
 
-load("@rules_rust//rust:defs.bzl", "rust_shared_library")
+load("@rules_rust//rust:defs.bzl", "rust_library")
 load("//providers:providers.bzl", "WasmComponentInfo", "WitInfo")
 load("//common:common.bzl", "WASM_TARGET_TRIPLE")
 
@@ -109,7 +109,7 @@ def rust_wasm_component(
     """
     Builds a Rust WebAssembly component.
     
-    This macro combines rust_shared_library with WASM component conversion.
+    This macro combines rust_library with WASM component conversion.
     
     Args:
         name: Target name
@@ -121,7 +121,7 @@ def rust_wasm_component(
         rustc_flags: Additional rustc flags
         profiles: List of build profiles to create ["debug", "release", "custom"]
         visibility: Target visibility
-        **kwargs: Additional arguments passed to rust_shared_library
+        **kwargs: Additional arguments passed to rust_library
     
     Example:
         rust_wasm_component(
@@ -169,13 +169,13 @@ def rust_wasm_component(
             "--target=" + WASM_TARGET_TRIPLE,
         ]
 
-        rust_shared_library(
+        rust_library(
             name = rust_library_name,
             srcs = srcs,
             deps = deps,
             edition = "2021",
             crate_features = crate_features,
-            rustc_flags = profile_rustc_flags,
+            rustc_flags = profile_rustc_flags + ["--crate-type=cdylib"],
             visibility = ["//visibility:private"],
             **kwargs
         )