feat: instrument the cache layer

[wa0x6e]

🧿 Current issues / What's wrong ?

We have no insight about the performance of the cache layer.

💊 Fixes / Solution

Fix #940

Instrument all requests going through the cache layer, categorized by cache status

🚧 Changes

Each return of the cache functions is instrumented.

Various cache status are:

• HIT: Cache found and served
• MISS: Cache not found, will be cached
• SKIP: Will not cache
• UNQUALIFIED: Can not be cached because data is not final

🛠️ Tests

[codecov]

Codecov Report

Attention: 33 lines in your changes are missing coverage. Please review.

Comparison is base (7fc6d72) 71.15% compared to head (8c2d6c1) 72.27%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #942      +/-   ##
==========================================
+ Coverage   71.15%   72.27%   +1.11%     
==========================================
  Files          11       12       +1     
  Lines         638      689      +51     
  Branches      101      108       +7     
==========================================
+ Hits          454      498      +44     
- Misses        180      188       +8     
+ Partials        4        3       -1     

Files	Coverage Δ
src/methods.ts	100.00% <100.00%> (ø)
src/metrics.ts	63.15% <100.00%> (+6.90%)	⬆️
src/scores.ts	84.09% <58.82%> (-15.91%)	⬇️
src/redis.ts	71.42% <11.11%> (+71.42%)	⬆️
src/helpers/cache.ts	73.13% <73.13%> (ø)

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[ChaituVR]

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