- Add `--class-access-modifier` flag.

- Rename `--class-access-modifier` to `--type-access-modifier`.
- Use `AccessModifier` enum instead of string and extend to `Internal` value.
- Add `Access` property to `CodeClass` and `CodeEnum`.
- Use `CSharpRefiner` to set `Access` property from configuration.
- Extend `CodeClassDeclarationWriter` and `CodeEnumWriter` to write actual type access modifier.

- Add `TypeAccessModifierOption` to client handlers.
- Add `TypeAccessModifier` to workspace `ApiClientConfiguration` and `ApiClientConfigurationComparer`.
- Add default value of `Public` for stringified `TypeAccessModifier` properties.
- Add test case for `CSharpRefiner`.
- Implement `IAccessibleElement` for `CodeClass` and `CodeEnum`.

- Use parenthesized pattern matching for type checks.

Signed-off-by: Vincent Biret <[email protected]>