define block hash provider and default impl using frame_system (#4080)
This PR introduces `BlockHashProvider` into `pallet_mmr::Config` This type is used to get `block_hash` for a given `block_number` rather than directly using `frame_system::Pallet::block_hash` The `DefaultBlockHashProvider` uses `frame_system::Pallet::block_hash` to get the `block_hash` Closes: #4062
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