[Optimisation] Remove unnecessary libraries from dependencies

Acceptance criteria

Dismiss RKA utility and jsbi library

Rabin-Karp algorithm is not a part of the solution anymore. Corresponding code and jsbi library can be removed.

Remove MerkleTreeJS library and write custom function to calculate merkle tree root hash

MerkleTreeJS drags crypto-js with itself which is not needed for the operation of library.

Remove dangling unused libs