capi: export RpcDaemon configuration settings

[canepat]

This PR exports our Silkworm RPC Daemon configuration settings in the C API interface. The following options can be customised (all of them are opt-in, default values provide a meaningful configuration):

• number of I/O execution contexts to use in concurrency mode
• configuration options for interface log of Execution JSON-RPC end-point
• host address for Execution JSON-RPC end-point
• listening port number for Execution JSON-RPC end-point
• API namespace specification (comma-separated list of API namespaces)
• number of threads in worker pool (for long-run tasks)
• list of CORS domains
• path to the JWT file in UTF-8
• flag indicating if JSON-RPC strict compatibility w/ Erigon is supported
• flag indicating if WebSocket support is enabled
• flag indicating if compression of WebSocket messages is supported
• flag indicating if compression of HTTP messages is supported

Extras

This PR also adds the logging verbosity level as Silkworm instance global setting. This is necessary to make Silkworm emit logs with the same verbosity as the C API client code, if needed.