Add generic Ordered Cache behaviour and implementation

[pasqu4le]

Motivation

Part of #2427

Multiple caches exist to keep a page of the most recent n elements.
More are to be implemented, so it would be good to abstract their implementation.

Changelog

Enhancements

This PR adds a behaviour and a macro (providing an implementation) to create this type of caches.
It also redefines the existing ones using the new macro.

Checklist for your PR

Note: I did not write tests for the new module. however the existing tests for the transactions and blocks caches should cover the most important cases

• I added an entry to CHANGELOG.md with this PR
• If I added new functionality, I added tests covering it.
• If I fixed a bug, I added a regression test to prevent the bug from silently reappearing again.
• I checked whether I should update the docs and did so if necessary
• If I added/changed/removed ENV var, I should update the list of env vars in https://github.com/poanetwork/blockscout/blob/master/docs/env-variables.md to reflect changes in the table here https://poanetwork.github.io/blockscout/#/env-variables?id=blockscout-env-variables

[coveralls]

Pull Request Test Coverage Report for Build 2993a38b-976b-44f3-a470-85e738b27086

• 14 of 22 (63.64%) changed or added relevant lines in 7 files are covered.
• 4 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-0.3%) to 79.156%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
apps/explorer/lib/explorer/chain.ex	4	5	80.0%
apps/explorer/lib/explorer/chain/ordered_cache.ex	0	7	0.0%

Files with Coverage Reduction	New Missed Lines	%
apps/block_scout_web/lib/block_scout_web/controllers/chain/market_history_chart_controller.ex	2	71.43%
apps/explorer/lib/explorer/chain/cache/transaction_count.ex	2	84.21%

Totals
Change from base Build 9b8975aa-67e5-4419-90f4-0d509483294b:	-0.3%
Covered Lines:	5157
Relevant Lines:	6515

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💛 - Coveralls

[vbaranov]

@pasqu4le I installed this cache generalization to stg server and the issue is that after a while the price and marketcap charts disappear together with the values at the bottom of charts. I am not sure that exactly this PR caused this problem, but I guess it could be since we recently implemented a cache for charts data #2035. You can reproduce the behaviour in the stg server.

[pasqu4le]

@vbaranov I don't how it's possible for this PR to be the cause.
It cannot have caused the problem directly, because this is a generic cache macro only for ordered lists caches, only the blocks and transactions ones have been re-implemented with it.

Also indirectly there does not seem to be any correlation.

P.s. It's probably a good idea to write a general macro for this type of caches that store only a finite number of "points". With it and the one in this PR we'd probably cover them all, I'll work on it and make a separate PR.

[vbaranov]

The problem found was caused by #2473 update that fixed #2550

[vbaranov]

@pasqu4le could you please fix credo test?

[pasqu4le]

@vbaranov sorry about that, they are fixed now