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This PR makes makes ChatCompletionCache support component config
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## Why are these changes needed?
Ensures we have a path to serializing ChatCompletionCache , similar to
the ChatCompletion client that it wraps.
This PR does the following
- Makes CacheStore serializable first (part of this includes converting
from Protocol to base class). Makes it's derivatives serializable as
well (diskcache, redis)
- Makes ChatCompletionCache serializable
- Adds some tests
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solves. -->
## Related issue number
<!-- For example: "Closes #1234" -->
Closes#5141
## Checks
- [ ] I've included any doc changes needed for
<https://microsoft.github.io/autogen/>. See
<https://github.com/microsoft/autogen/blob/main/CONTRIBUTING.md> to
build and test documentation locally.
- [ ] I've added tests (if relevant) corresponding to the changes
introduced in this PR.
- [ ] I've made sure all auto checks have passed.
cc @nour-bouzid
* Add ChatCompletionCache along with AbstractStore for caching completions
* Addressing comments
* Improve interface for cachestore
* Improve documentation & revert protocol
* Make cache store typed, and improve docs
* remove unnecessary casts
