Provide a VS Code setting for catalog url that Kaoto editor can read

[apupier]

• One setting in VS Code Preferences
  • as first iteration use a simple string (can be interesting to have a list in the future)
  • description should mention where to find the documentation to generate a new set of catalog
  • placeholder pointing to the existing example (which means we should not modify it anymore, create a tag then?) no placeholder possible, provided the catalog url in description (and no go to lien possible for description)
  • default value set to blank so that it is using the embedded versions (and avoids potential issues with network)
• On Kaoto editor editor side, it needs to access the vscode api
  • in multiplyign architecture the VS Code APi is providined through the bus parameter https://github.com/KaotoIO/vscode-kaoto/blob/c9efe777e08878ffb03aabdc7074787704df7f12/src/webview/KaotoEditorEnvelopeApp.ts#L9
  • manipulation of settings is through vscode.workspace API https://code.visualstudio.com/api/references/vscode-api#workspace
  • example of getConfiguration https://github.com/camel-tooling/camel-lsp-client-vscode/blob/ac3a44ff4610c50c19526e6d1ab8c5dc79742fe2/package.json#L73
  • we will also need a onDidChangeConfiguration to react to updates of settings (determine how to handle it, automatically reload? ask for user if he/she wants to reload?)

Note: How to test it in VS Code? local catalog committed?

[apupier]

Might require to change the setting from the Kaoto editor too, otherwise changing in the kaoto editor won't be kept for the next time an editor is opened.