RPC cli flags

[kamilsa]

Add the following flags:

      --rpc-external
          Listen to all RPC interfaces.

          Default is local. Note: not all RPC methods are safe to be exposed publicly. Use an RPC proxy server to filter out dangerous methods. More details: <https://docs.substrate.io/main-docs/build/custom-rpc/#public-rpcs>. Use `--unsafe-rpc-external` to suppress the warning if you understand the risks.

      --unsafe-rpc-external
          Listen to all RPC interfaces.

          Same as `--rpc-external`.

      --rpc-methods <METHOD SET>
          RPC methods to expose.

          - `unsafe`: Exposes every RPC method.
          - `safe`: Exposes only a safe subset of RPC methods, denying unsafe RPC methods.
          - `auto`: Acts as `safe` if RPC is served externally, e.g. when `--{rpc,ws}-external` is
            passed, otherwise acts as `unsafe`.

          [default: auto]

          Possible values:
          - auto:
            Expose every RPC method only when RPC is listening on `localhost`, otherwise serve only safe RPC methods
          - safe:
            Allow only a safe subset of RPC methods
          - unsafe:
            Expose every RPC method (even potentially unsafe ones)

      --ws-external
          Listen to all Websocket interfaces.

          Default is local. Note: not all RPC methods are safe to be exposed publicly. Use an RPC proxy server to filter out dangerous methods. More details: <https://docs.substrate.io/main-docs/build/custom-rpc/#public-rpcs>. Use `--unsafe-ws-external` to suppress the warning if you understand the risks.

      --unsafe-ws-external
          Listen to all Websocket interfaces.

          Same as `--ws-external` but doesn't warn you about it.

Unsafe methods could be found here. Correct behaviour for unsafe methods, when they are prohibited is to return message that method is unsafe

zombienet needed flags:

--rpc-cors all
--unsafe-rpc-external
--rpc-methods unsafe
--unsafe-ws-external
--no-mdns
--prometheus-external

safe methods: search check_if_safe