feat(bazel): add an ng_package rule (#22221)

This produces a directory following the Angular Package layout spec.

Includes integration test coverage by making a minimal ng_package in integration/bazel.
Unit tests verify the content of the @angular/core and @angular/common packages.

This doesn't totally match our current output, but is good enough to unblock some
early adopters.

It re-uses logic from the rollup_bundle rule in rules_nodejs. It should also
eventually have the .pack and .publish secondary targets like npm_package rule.

PR Close #22221

integration/bazel/BUILD.bazel

@@ -2,25 +2,15 @@ package(default_visibility = ["//visibility:public"])
 
 filegroup(
     name = "node_modules",
-    # Workaround https://github.com/bazelbuild/bazel/issues/4242
-    # Can't just glob(["node_modules/**/*.{js,d.ts,json}"])
-    srcs = glob(["/".join([
-        "node_modules",
-        pkg,
-        "**",
-        ext,
-    ]) for pkg in [
-        "@angular",
-        "@types",
-        "bytebuffer",
-        "protobufjs",
-        "reflect-metadata",
-        "tsickle",
-        "typescript",
-        "zone.js",
-    ] for ext in [
-        "*.js",
-        "*.json",
-        "*.d.ts",
-    ]]),
+    srcs = glob(
+        ["node_modules/**/*"],
+        # Exclude directories that commonly contain filenames which are
+        # illegal bazel labels
+        exclude = [
+            # e.g. node_modules/adm-zip/test/assets/attributes_test/New folder/hidden.txt
+            "node_modules/**/test/**",
+            # e.g. node_modules/xpath/docs/function resolvers.md
+            "node_modules/**/docs/**",
+        ],
+    ),
 )