Fix: Throw InvalidDefinition exception when definition can not be autoloaded

[localheinz]

This PR

• throws an InvalidDefinition exception when a potential definition can not be autoloaded

[codecov]

Codecov Report

Merging #302 into main will increase coverage by 0.72%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##               main     #302      +/-   ##
============================================
+ Coverage     98.56%   99.29%   +0.72%     
- Complexity      102      103       +1     
============================================
  Files            23       23              
  Lines           279      282       +3     
============================================
+ Hits            275      280       +5     
+ Misses            4        2       -2     

Impacted Files	Coverage Δ	Complexity Δ
src/Definitions.php	100.00% <100.00%> (+7.69%)	11.00 <0.00> (ø)
src/Exception/InvalidDefinition.php	100.00% <100.00%> (ø)	3.00 <1.00> (+1.00)

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