Implement mempool.space websocket API and client

[oleonardolima]

Description:

In order to consume new blocks data from mempool.space through its WebSocket API, we need to refactor the current implementation to use tokio-tungestenite WebSocket-client and add an API and client for mempool.space integration and data translation/parsing.

Resources:

• mempool.space websocket API: https://mempool.space/docs/api/websocket
• mempool.space websocket 'block' response data: https://github.com/mempool/mempool/blob/master/backend/src/api/websocket-handler.ts#L412-L416
• mempool.space 'block' extension data: https://github.com/mempool/mempool/blob/master/backend/src/mempool.interfaces.ts#L82-L101

Testing:

• running mempool.space locally: https://github.com/mempool/mempool/tree/master/docker
• running regtest locally: https://bitcoindevkit.org/bdk-cli/regtest/#bonus-docker