refactor: rename files and update method signatures; add tests for ca…

[CoderNamedHendrick]

…che functionality

[codecov]

Codecov Report

Attention: Patch coverage is 85.71429% with 5 lines in your changes missing coverage. Please review.

Project coverage is 96.24%. Comparing base (6994d2e) to head (cad3cdf).
Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
lib/src/in_memory_store.dart	73.68%	5 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main       #2       +/-   ##
===========================================
+ Coverage   80.70%   96.24%   +15.53%     
===========================================
  Files           3        3               
  Lines         114      133       +19     
===========================================
+ Hits           92      128       +36     
+ Misses         22        5       -17     

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