### SUMMARY

Update validate-modules to report messages using named error codes like `version-added` instead of error numbers like `E305`.

This would match the behavior of other tools we use, such as pylint, which have one named error code per rule. This will also make ignore entries much easier to read.

Doing this before 2.9 is released will avoid potential backwards compatibility issues with ignore entries in collections.

##### ISSUE TYPE

Feature Idea

##### COMPONENT NAME

validate-modules

except ValueError:
            mod_version_added = StrictVersion('0.0')
        if self.base_branch and 'stable-' in self.base_branch:
            metadata.pop('metadata_version', None)
            metadata.pop('version', None)
            if metadata != existing_metadata:
                self.reporter.error(
                    path=self.object_path,
                    code=334,
                    msg=('ANSIBLE_METADATA cannot be changed in a point release for a stable branch')
                )
        options = doc.get('options', {}) or {}
        should_be = '.'.join(ansible_version.split('.')[:2])
        strict_ansible_version = StrictVersion(should_be)
        for option, details in options.items():
            try:
                names = [option] + details.get('aliases', [])
            except (TypeError, AttributeError):
                
                continue
            if any(name in existing_options for name in names):
                for name in names:
                    existing_version = existing_options.get(name, {}).get('version_added')
                    if existing_version:
                        break
                current_version = details.get('version_added')
                if str(current_version) != str(existing_version):
                    self.reporter.error(
                        path=self.object_path,
                        code=309,