Session persistence optimization

[fquffio]

This PR improves session persistence by avoiding persisting a session that had no changes. Additionally, test coverage has increased significantly, and the in-memory cache has been refactored to use @heyputer/kv.js instead of a custom home-made implementation.

[changeset-bot]

🦋 Changeset detected

Latest commit: adab7ff

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@chialab/sveltekit-utils	Minor

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 81.17647% with 32 lines in your changes missing coverage. Please review.

Project coverage is 74.57%. Comparing base (73a1152) to head (adab7ff).

Files with missing lines	Patch %	Lines
src/lib/server/hooks/session.ts	0.00%	13 Missing ⚠️
src/lib/server/cache/redis.ts	16.66%	10 Missing ⚠️
src/lib/server/session.ts	94.68%	5 Missing ⚠️
src/lib/server/cache/in-memory.ts	88.46%	3 Missing ⚠️
src/lib/utils/index.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             next       #6       +/-   ##
===========================================
+ Coverage   36.69%   74.57%   +37.87%     
===========================================
  Files          19       20        +1     
  Lines         714      704       -10     
  Branches       91      161       +70     
===========================================
+ Hits          262      525      +263     
+ Misses        444      177      -267     
+ Partials        8        2        -6     

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