Add caching to BaseChatModel (issue #1644) (#5089)
# Add caching to BaseChatModel
Fixes #1644
(Sidenote: While testing, I noticed we have multiple implementations of
Fake LLMs, used for testing. I consolidated them.)
## Who can review?
Community members can review the PR once tests pass. Tag
maintainers/contributors who might be interested:
Models
- @hwchase17
- @agola11
Twitter: [@UmerHAdil](https://twitter.com/@UmerHAdil) | Discord:
RicChilligerDude#7589
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Co-authored-by: Harrison Chase <hw.chase.17@gmail.com>
