feat(node/rpc): RPC Server Launcher

[refcell]

Background

kona-rpc uses jsonrpsee to construct server and client JSON-RPC APIs.

In jsonrpsee, these JSON-RPC api implementations can be converted into a RpcModule. Since kona will have multiple RpcModules, modules can be merged using the merge() method.

After merging all the modules, the jsonrpsee::server::Server instance is started, passing in the modules as an argument.
Starting the server returns a ServerHandle that can be awaited on using the stopped() method.

Output

This ticket is to create a ServerLauncher that constructs the jsonrpsee::server::Server and accepts modules via a merge method. It should lastly have a start method that consumes the ServerLauncher itself, starting the server with its modules, and returns the ServerHandle.

Future tickets will tackle implementations of the JSON-RPC APIs in kona-rpc and merging them into the ServerLauncher.