feat(cache): Introduce cache version storage

[silasjoisten]

No description provided.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 85.71429% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 93.90%. Comparing base (006cdab) to head (cef8c89).

Files with missing lines	Patch %	Lines
src/StoryblokClient.php	66.66%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master      #69      +/-   ##
============================================
+ Coverage     93.88%   93.90%   +0.01%     
- Complexity      461      463       +2     
============================================
  Files            72       73       +1     
  Lines          1620     1624       +4     
============================================
+ Hits           1521     1525       +4     
  Misses           99       99              

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