Add tunnel debug options

[tbinna]

Forge tunnel has new debug options required to start a tunnel in debug mode.

Add the following options to the executor and pass them through to the tunnel process:

• -e, --environment [environment] specify the environment (see your default environment by running forge settings list)
• -f,--debugFunctionHandlers <debugFunctionHandlers...> list of function handlers declared on manifest to debug, separated by space. This option must be specified if debug mode is enabled. It is only used for Node runtime debugger
• -p,--debugStartingPort [debugStartingPort] starting port to use for debugging, multiple handlers will get subsequent ports. It is only used for Node runtime debugger (default: "9229")

https://developer.atlassian.com/platform/forge/cli-reference/tunnel/