feat: alternative sharded redis cache

[wschurman]

Why

This is the alternative to https://github.com/expo/entity/pull/196 mentioned in https://github.com/expo/entity/pull/196#issuecomment-1267750484.

How

Instead of doing the sharding logic in the entity cache adapter level, do it within the redis interface. This requires some bookkeeping and tricks within the multi-redis logic, but isn't horrendous.

The main thing to review is the ShardedRedis class in the test. This is what would need to be duplicated to an application that uses it (though with a real consistent hash).

Test Plan

Run test (same test as other PR to prove it works).

[codecov[bot]]

Codecov Report

Merging #197 (6f53cf0) into main (dbf1e03) will not change coverage. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #197   +/-   ##
=======================================
  Coverage   96.17%   96.17%           
=======================================
  Files          81       81           
  Lines        2065     2065           
  Branches      269      245   -24     
=======================================
  Hits         1986     1986           
- Misses         74       79    +5     
+ Partials        5        0    -5     

Flag	Coverage Δ
integration	96.17% <100.00%> (ø)
unittest	96.17% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...tity-cache-adapter-redis/src/GenericRedisCacher.ts	100.00% <ø> (ø)
...ntity-cache-adapter-redis/src/RedisCacheAdapter.ts	100.00% <100.00%> (ø)
packages/entity/src/EntityLoader.ts	89.36% <0.00%> (ø)
...ty-example/src/adapters/InMemoryDatabaseAdapter.ts	45.83% <0.00%> (ø)

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[wschurman]

This was a proof of concept. No longer needed for now.