Spec-classes

This is a minor release which fixes one minor oversight:

* The `Alias` type will now protect the `fallback`, if provided, by deepcopying it prior to returning it; preventing accidental mutations downstream.

This is a relatively small feature release, which:
* adds support for nested `Alias` instances (e.g. `Alias("a.b.c['d']")`).
* fixes labeling of `Literal` types.

This is another minor release:

* Extended type checking to `tuple` and `type` annotations.
* Removed weakref'ed spec-class instance state that was slowing down instantiation of simple classes by as much as 400%.
* Fixed `_GenericAlias` catching all errors during setting of `__orig_class` in Python 3.11+ (preventing `Keyed*` classes from raising on type errors).
* Migrated to `ruff` tooling for linting.

This is a minor release that fixes one issue affecting spec-class state imputation when spec-classes are coming from deserialized representations.

This is a minor release the improves the behaviour of invalidation during instantiation, and wildcard invalidations from invalidating themselves. With this release, invalidation will not be enabled until after instances are fully instantiated.

This is a minor release with one bugfix: resolving of nested types within a class.