Constraint proto_library deps and exports on ProtoInfo provider.

This makes the constraint more general, perhaps allows users to create there own version of proto_library.

Because proto_library advertises the ProtoInfo provider, all the old uses will continue to work in Bazel.

PiperOrigin-RevId: 404258851

src/main/java/com/google/devtools/build/lib/rules/proto/BazelProtoLibraryRule.java

@@ -61,7 +61,8 @@ public RuleClass build(RuleClass.Builder builder, final RuleDefinitionEnvironmen
         <code>proto_library</code> targets.
         It may not depend on language-specific libraries.
         <!-- #END_BLAZE_RULE.ATTRIBUTE --> */
-        .override(attr("deps", LABEL_LIST).allowedRuleClasses("proto_library").allowedFileTypes())
+        .override(
+            attr("deps", LABEL_LIST).mandatoryProviders(ProtoInfo.PROVIDER.id()).allowedFileTypes())
         /* <!-- #BLAZE_RULE(proto_library).ATTRIBUTE(srcs) -->
         The list of <code>.proto</code> and <code>.protodevel</code> files that are
         processed to create the target. This is usually a non empty list. One usecase
@@ -77,7 +78,10 @@ public RuleClass build(RuleClass.Builder builder, final RuleDefinitionEnvironmen
         List of proto_library targets that can be referenced via "import public" in the proto
         source.
         <!-- #END_BLAZE_RULE.ATTRIBUTE --> */
-        .add(attr("exports", LABEL_LIST).allowedRuleClasses("proto_library").allowedFileTypes())
+        .add(
+            attr("exports", LABEL_LIST)
+                .mandatoryProviders(ProtoInfo.PROVIDER.id())
+                .allowedFileTypes())
         /* <!-- #BLAZE_RULE(proto_library).ATTRIBUTE(strip_import_prefix) -->
         The prefix to strip from the paths of the .proto files in this rule.