[feature] enable caching on queries with NOT

[Dingying0410]

Summary

This PR enables queries with that has both NOT and other bound queries.

Previously we decided to not to cache any queries with NOT, however, queries with both NOT and other bound queries can be cached. E.g

Site.where(a: 1).where.not(b: 1) can be cached based on a as dependency 
Site.where.not(b: 1) should not be cached

My current approach is to return bind_params when we parse a notequal statement, so that

• for queries with only NOT, we return an empty object
• for queries with NOT and other bound conditions, it will involve those conditions and cache

Test plan

rspec

[codecov[bot]]

Codecov Report

Merging #62 (56c39e2) into main (8492ded) will increase coverage by 0.05%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #62      +/-   ##
==========================================
+ Coverage   97.31%   97.37%   +0.05%     
==========================================
  Files          34       34              
  Lines        2125     2283     +158     
==========================================
+ Hits         2068     2223     +155     
- Misses         57       60       +3     

Impacted Files	Coverage Δ
lib/redis_memo/memoize_query/cached_select.rb	93.33% <100.00%> (-0.70%)	:arrow_down:
spec/memoize_query_spec.rb	100.00% <100.00%> (ø)
lib/redis_memo/middleware.rb	27.27% <0.00%> (-6.07%)	:arrow_down:
lib/redis_memo.rb	97.05% <0.00%> (ø)
lib/redis_memo/memoizable/invalidation.rb	100.00% <0.00%> (ø)
lib/redis_memo/memoize_query.rb	97.95% <0.00%> (+0.90%)	:arrow_up:
spec/cache_spec.rb	98.03% <0.00%> (+1.02%)	:arrow_up:
lib/redis_memo/cache.rb	100.00% <0.00%> (+1.78%)	:arrow_up:

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