Feature request: an Action for sending arbitrary messages to TCP Client

[wis]

Is your feature request related to a problem? Please describe.

Since the day I started using Kanata I wanted a way to do this, that is besides using cmd, cmd comes with a big security risk, especially if you run Kanata as Admin or superuser/root, and cmd is too slow on Windows, due to the higher executable startup time on Windows, ~10X slower than on Linux, on Windows it takes 100ms for a "Hello World" C program to run, on Linux it takes less than 10 milliseconds or even less than 5ms. a TCP message to a local TCP client takes less than 1 millisecond (microseconds).

Latency is really important if you want to run code on each key press/release/tap, or when performing any keyboard behavior that can be modeled/configured in Kanata, e.g. a chord. (feels/seems related to #797 )

Describe the solution you'd like.

I would like to use TCP as an IPC mechanism, also to replace the use of cmd, I no longer want to use Kanata compiled with the cmd feature flag.

Action naming suggestion: push-msg
usage example:

(defsrc a s d)
(deflayer a 
(push-msg hello "how are you")
(push-msg $what (arbitrary S (expression (that can nest) here) )
)
(defvar
what any
)

TCP server message JSON schema:

{ "MessagePush": { "message": ["an", "(arbitrarily nested)", "array", "not", "a", "string"] } }

the server message for the above examples would be:

{ "MessagePush": { "message": ["hello", "how are you"] } }

and

{ "MessagePush": { "message": ["any", ["arbitrary", "S", ["expression", ["that", "can", "nest"], "here" ] ] ] } }

formatted with Prettier

{
  "MessagePush": {
    "message": [
      "any",
      ["arbitrary", "S", ["expression", ["that", "can", "nest"], "here"]]
    ]
  }
}

Describe alternatives you've considered.

None that I could find.

Additional context

This is related to #496, this action/feature enables you to send events on any key down and up using fake keys, explicitly. this is my top use case out of this feature as of now, but I can see many scenarios/cases where this feature/action would be needed too.