Turn orderless-affix-dispatch into a matcher

[minad]

This is just an experiment, exploring the idea from https://github.com/oantolin/orderless/pull/162#issuecomment-1947958416 where dispatchers are turned into matching styles.

Only the last commit is relevant: https://github.com/oantolin/orderless/pull/163/commits/bacd0ad4de0f5e2c13d6d2618371f9413bae5629

Advantages:

• Simplicity?
• Unification of matchers/dispatchers

Disadvantages:

• The orderless-matching-styles are not orderless anymore
• One has to introduce a :stop return value to implement dispatching

So maybe this doesn't change much effectively, except achieving that matchers and dispatchers are pressed into the same framework?