Use aggregated types for `RuntimeFreezeReason` and better examples of `MaxFreezes` (#4615)
This PR aligns the settings for `MaxFreezes`, `RuntimeFreezeReason`, and `FreezeIdentifier`. #### Future work and improvements https://github.com/paritytech/polkadot-sdk/issues/2997 (remove `MaxFreezes` and `FreezeIdentifier`)