Allow provider init with cache configuration & add tests

[fselmo]

What was wrong?

Closes #3394

How was it fixed?

• Allow provider init with request cache configuration
• Add test to test that all providers init without caching by default and can be instantiated with caching configs

Todo:

• Clean up commit history
• Add or update documentation related to these changes
• Add entry to the release notes

Cute Animal Picture

[clover-es]

Maybe tests test_caching_requests_does_not_share_state_between_providers and test_async_request_caching_does_not_share_state_between_providers should be adapted as well?

I know previously wasn't tested either (probably that was an error), but I think that if the purpose is to test whether cache is shared, they should be initialized with cache_allowed_requests=True.

[reedsa]

nice work, lgtm!

[fselmo]

I know previously wasn't tested either (probably that was an error), but I think that if the purpose is to test whether cache is shared, they should be initialized with cache_allowed_requests=True.

That is definitely the case, good catch. Will add that in here.

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edit: I also added to those tests the case where a cache is shared, as a sanity check and for quicker code readability.

[kclowes]

LGTM! Just left a small comment on the IPCProvider ⛵