Enhancement Ability to inherit/merge settings

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Vscode / Extension 3.5

Initially I tried to use .luarc.json file per workspace but everything is too similiar and one change means changing them for all

Current Layout

Root/Folder/WorkspaceA
Root/Folder/WorkspaceB
...

In the code-workspace file I set the global stuff
runtime.plugin
workspace.library (all workspaces base off the same libraries)

This works fine until I have to add libraries on an individual workspace. I have to copy the workspace.library settings to the workspace settings.json and then add my extra libraries. So if I change anything in code-workspace libraries I then have to go and remember to change it in any settings.json that may have changed.

```json
{
// The following settings would merge with the next higher scope instead of overwriting
"Lua.workspace.mergeIgnore": ["pathToAdditionalIgnore"]
"Lua.workspace.mergeLibrary": ["pathToAdditionalLibrary"]
}
```

No files, tests, or entry points are named. Start by locating how workspace settings are inherited and merged, then define the behavior for Lua.workspace.mergeIgnore and Lua.workspace.mergeLibrary across code-workspace and workspace settings; done means higher-scope values remain effective while workspace-specific paths are added.

Written by the indexing model from the issue text.