feat(skyrim-platform): add builtin IPC call to SkyrimPlatform_OnLoadPluginFile

[Pospelove]

[!IMPORTANT] Adds IPC call SkyrimPlatform_OnLoadPluginFile to modify plugin file loading in CommonExecutionListener.

• Behavior:
  • Adds PatchPluginFile method in CommonExecutionListener to modify plugin file loading with IPC call SkyrimPlatform_OnLoadPluginFile.
  • Introduces OnLoadPluginFileCallback to handle patched source code.
  • Updates LoadPluginFile to use PatchPluginFile for potential source code modification.
• Data Structures:
  • Adds tmpPatchedPluginSources as std::optional<std::string> in CommonExecutionListener to store patched source code.
  • Defines Msg struct for IPC communication with onLoadPluginFileCallback, self, and pluginPathUtf8 fields.

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