Cleanup Schema cache per request

[dplewis]

Closes: #6061

I updated the tests to run against enableSingleSchemaCache: false.

The cache isn't cleared if enableSingleSchemaCache: true

Lets see how this goes...

[codecov]

Codecov Report

Merging #6126 into master will decrease coverage by <.01%.
The diff coverage is 83.33%.

@@            Coverage Diff             @@
##           master    #6126      +/-   ##
==========================================
- Coverage   93.72%   93.71%   -0.01%     
==========================================
  Files         165      165              
  Lines       11199    11210      +11     
==========================================
+ Hits        10496    10506      +10     
- Misses        703      704       +1

Impacted Files	Coverage Δ
src/Adapters/Cache/RedisCacheAdapter/index.js	97.95% <80%> (-2.05%)	⬇️
src/PromiseRouter.js	89.01% <85.71%> (-0.41%)	⬇️
...dapters/Storage/Postgres/PostgresStorageAdapter.js	97.01% <0%> (-0.09%)	⬇️
src/RestWrite.js	93.72% <0%> (+0.33%)	⬆️

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[dplewis]

This should work for every express router endpoint.

If not an endpoint like performInitialization on startup and the similar, will always leave a key / value in redis.

A TTL value will clean those up.

[acinader]

lgtm. documentation?

[dplewis]

Sure I can add documentation.