[BUGFIX] Respect cache lifetime when getting cached solutions

[eliashaeussler]

When calling SolutionsCache::get(), the configured cache lifetime is now properly respected. If caching is disabled by setting cache lifetime to 0 seconds, SolutionsCache::get() will always return null. For this, a new method Configuration::isCacheEnabled() was added.

[codeclimate]

Code Climate has analyzed commit b08d916 and detected 0 issues on this pull request.

The test coverage on the diff in this pull request is 100.0% (50% is the threshold).

This pull request will bring the total coverage in the repository to 87.0% (0.0% change).

View more on Code Climate.

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.05 🎉

Comparison is base (c2d6720) 87.01% compared to head (b08d916) 87.06%.

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #127      +/-   ##
============================================
+ Coverage     87.01%   87.06%   +0.05%     
- Complexity      274      277       +3     
============================================
  Files            44       44              
  Lines           978      982       +4     
============================================
+ Hits            851      855       +4     
  Misses          127      127              

Impacted Files	Coverage Δ
Classes/Cache/SolutionsCache.php	100.00% <100.00%> (ø)
Classes/Configuration/Configuration.php	100.00% <100.00%> (ø)

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