Return script compilation result on exec:

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## Summary

Currently, the `exec:` command returns `RESPONSE:exec:script executed`. If the script fails for whatever reason, the client is never told about the reason and the script fails silently.

Amnesia already has a feature to compile the script file with output:

```cpp
mpEngine->GetResources()->GetScriptManager()->CreateScript(sScriptFile, apOutput);
```

You can see this line along with its usage in [LuxMap.cpp#L421](https://github.com/amnesia-spelos/amnesia-tdd-tcp/blob/main/src/amnesia/src/game/LuxMap.cpp#L421).

We should be returning the output as part of `RESPONSE:exec`.

## Current Implementation

You can find the current implementation in the following file:

https://github.com/amnesia-spelos/amnesia-tdd-tcp/blob/c17c8b05f6d03249e844dd753405654f8412a713/src/amnesia/src/game/LuxSocketServer.cpp#L199-L211