Add view functions to Proxy pallet for runtime-specific type configuration #7297 (#7320)

Solves https://github.com/paritytech/polkadot-sdk/issues/7297

I added a ProxyApi runtime API to the Proxy pallet with two methods:

check_permissions: Checks if a RuntimeCall passes a ProxyType's
InstanceFilter.
is_superset: Verifies if one ProxyType includes another.




Polkadot address: 121HJWZtD13GJQPD82oEj3gSeHqsRYm1mFgRALu4L96kfPD1

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Co-authored-by: Bastian Köcher <git@kchr.de>
Co-authored-by: Bastian Köcher <info@kchr.de>