Revert MainActor change

fix bug where identical, identical reversed and hex threw error, e.g.…

… `0000` compared to `0000`.

Fix library product for BytesMutation package

Add XCTAssertBytesEqual and XCTAssertBytesFromHexEqual method to new …

…package and library XCTAssertBytesEqual. Expose BytesMutation as a library.

Appending info to README

Documentation and README