Add getDirty method

[cleptric]

See #10292

[codecov-io]

Codecov Report

Merging #10366 into master will decrease coverage by -0.01%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master   #10366      +/-   ##
============================================
- Coverage      94.9%   94.89%   -0.01%     
- Complexity    12087    12088       +1     
============================================
  Files           422      422              
  Lines         30013    30015       +2     
============================================
  Hits          28484    28484              
- Misses         1529     1531       +2

Impacted Files	Coverage Δ	Complexity Δ
src/Datasource/EntityTrait.php	99.66% <100%> (ø)	134 <1> (+1)	✅
src/Cache/CacheRegistry.php	95.83% <0%> (-4.17%)	11% <0%> (ø)
src/Cache/CacheEngine.php	91.3% <0%> (-2.18%)	19% <0%> (ø)

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