[FRAME] Remove storage migration type (#3828)
Introduce migration type to remove data associated with a specific storage of a pallet. Based on existing `RemovePallet` migration type. Required for https://github.com/paritytech/polkadot-sdk/pull/3820 --------- Co-authored-by: Liam Aharon <[email protected]> Co-authored-by: Kian Paimani <[email protected]>