Add schema validation for collection files #369

This commit improves collection file editing and error detection
directly in the IDE. It adds YAML schema, IDE configuration and
automatic tests to validate it.

- Introduce a YAML schema for collection file.
- Use `yaml-language-server` for enhanced YAML support in VSCode.
- Add telemetry disabling in `configure_vscode.py` to respect user
  privacy.
- Add automated checks to validate YAML file structure against the
  schema.
- Remove unused properties and do not allow them in compiler.

scripts/validate-collections-yaml/requirements.txt

@@ -0,0 +1,6 @@
+attrs==23.2.0
+jsonschema==4.22.0
+jsonschema-specifications==2023.12.1
+PyYAML==6.0.1
+referencing==0.35.1
+rpds-py==0.18.1