feat: Add support for a default TTL

[TwiN]

Summary

This PR adds support for setting a default TTL using WithDefaultTTL.

This change is fully backward compatible, both at the API and at the behavioral level since before, the default TTL was gocache.NoExpiration and after this change, that remains unchanged.

Checklist

• Tested and/or added tests to validate that the changes work as intended, if applicable.
• Added the documentation in README.md, if applicable.

[codecov-commenter]

Codecov Report

Base: 98.65% // Head: 98.67% // Increases project coverage by +0.02% 🎉

Coverage data is based on head (78a3710) compared to base (eab552f).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master       #8      +/-   ##
==========================================
+ Coverage   98.65%   98.67%   +0.02%     
==========================================
  Files           4        4              
  Lines         446      454       +8     
==========================================
+ Hits          440      448       +8     
  Misses          4        4              
  Partials        2        2              

Impacted Files	Coverage Δ
gocache.go	100.00% <100.00%> (ø)

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