Add commitment to RPC request

[GitBolt]

Right now, most of the Client class method accept commitment parameter, however it isn't actually being used when the request is being sent.

This part is where the commitment needs to be added: https://github.com/SuperteamDAO/solathon/blob/master/solathon/core/http.py

Solana JSON RPC commitment reference: https://docs.solana.com/api/http#example

The logic is simple. If the user enters parameters array, with an object, having "commitment" key, then we have to add it to our request. The commitment is validated using this helper function: https://github.com/SuperteamDAO/solathon/blob/master/solathon/utils.py#L27

Also, some important RPC methods like send_transaction don't have commitment parameter accepted yet either, so that needs to be added too.