(feat) custom ratelimit for configuration provider

[chuan137]

No description provided.

[sven-rosenzweig]

Hi @chuan137 ,
Just stumbled around your PR.
From what I understood you are trying to add a custom section (besides global, defaults) to fetch rate limits from, right?

Generally I am missing the following:

• Description in this PR would be nice
• Extending the documentation
• Unit Test proofing that your scenario is working

[sven-rosenzweig]

Why are custom limits fetched via the get_global_rate_limits? Could it be part of the get_local_rate_limits?
If yes, we could thing about merging def get_local_rate_limits(self, scope, action, target_type_uri, **kwargs) and f get_global_rate_limits(self, action, target_type_uri, **kwargs) into a single method. Those are nearly identical.

 # Get local (for a certain scope) rate limits from provider.
        local_rate_limit = self.ratelimit_provider.get_local_rate_limits(
            scope, action, trimmed_target_type_uri
        )

move to

 # Get local (for a certain scope) rate limits from provider.
        local_rate_limit = self.ratelimit_provider.get_rate_limits(
            scope, action, trimmed_target_type_uri, 'local')
        ...
        custom_rate_limit = self.ratelimit_provider.get_rate_limits(
            scope, action, trimmed_target_type_uri, '<custom>')