[feature] support more queries with range (>=, <= etc)

[Dingying0410]

Summary

This PR is to support the queries that have range in it. such as '>=', '<=', etc., and also combine the NotEqual query we had in #62 since they can all be merged into the NodeHasComparator condition in this PR.

Regarding the rspec, I created several shared examples so we can test multiple similar behaviors.

Details

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

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

Also, as according to here, there are two forms of queries with comparator:

1. Site.where(a: 1).where('b > ?' 1) -- this will be analyzed as Arel::Nodes::Grouping when we parse the children of the wheres, thus, we look at node.expr of it. node.expr is usually a Arel::Nodes::SqlLiteral in this case
2. Site.where(a: 1).where(b: 2..Float::INFINITY) -- this will be analyzed as Arel::Nodes::LessThan when we parse the children of the wheres, thus, we categorize Arel::Nodes::LessThan and also other node class as NodeHasComparators

My current approach is to return bind_params when we parse these statements

• for queries with the only a comparator, we return an empty object
• for queries with the comparator and other bound conditions, it will involve those conditions and cache

Test plan

• rspec for >=, >, <=, <

TODO:

remove the duplicate Arel::Nodes::NotEqual block in #62 since they are brought in this PR

[codecov[bot]]

Codecov Report

Merging #63 (ae61aca) into main (ee26d55) will increase coverage by 0.05%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #63      +/-   ##
==========================================
+ Coverage   97.37%   97.42%   +0.05%     
==========================================
  Files          34       34              
  Lines        2209     2252      +43     
==========================================
+ Hits         2151     2194      +43     
  Misses         58       58              

Impacted Files	Coverage Δ
lib/redis_memo/memoize_query/cached_select.rb	93.28% <100.00%> (-0.05%)	:arrow_down:
spec/memoize_query_spec.rb	100.00% <100.00%> (ø)

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[donaldong]

The build failure seems legit btw