Bazel bzlmod support for grpc-web.

Updates the bazel-based build of grpc-web to use bzlmod.

The WORKSPACE file is retained for now, but it should probably be deleted since
it should be unused.

.bazelrc

@@ -1 +1,14 @@
 build --copt=-Wno-error=deprecated-declarations --host_copt=-Wno-error=deprecated-declarations
+
+# Required until this is the default; expected in Bazel 7
+common --enable_bzlmod
+
+# Load any settings specific to the current user.
+# .bazelrc.user should appear in .gitignore so that settings are not shared with team members
+# This needs to be last statement in this
+# config, as the user configuration should be able to overwrite flags from this file.
+# See https://docs.bazel.build/versions/master/best-practices.html#bazelrc
+# (Note that we use .bazelrc.user so the file appears next to .bazelrc in directory listing,
+# rather than user.bazelrc as suggested in the Bazel docs)
+try-import %workspace%/.bazelrc.user
+    

MODULE.bazel

@@ -0,0 +1,17 @@
+module(
+    name = "grpc_web",
+    version = "1.5.0",
+    compatibility_level = 1,
+    repo_name = "com_github_grpc_grpc_web",
+)
+
+bazel_dep(name = "protobuf", version = "23.1", repo_name = "com_google_protobuf")
+bazel_dep(name = "grpc", version = "1.65.0", repo_name = "com_github_grpc_grpc")
+bazel_dep(name = "rules_cc", version = "0.0.2")
+bazel_dep(name = "rules_proto", version = "6.0.2")
+
+# Needed to resolve https://github.com/bazelbuild/bazel-central-registry/issues/2538.
+single_version_override(
+  module_name = "grpc-java",
+  version = "1.64.0",
+)

WORKSPACE.bzlmod

@@ -0,0 +1,2 @@
+# Empty workspace file so that MODULE.bazel is used instead of the WORKSPACE system.
+# See https://bazel.build/external/migration#workspace.bzlmod