Make parallel extensions support inheritance

[leonard84]

fixes #1245

[codecov]

Codecov Report

Merging #1253 (3ecbfca) into master (3a8ae82) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##             master    #1253   +/-   ##
=========================================
  Coverage     76.58%   76.58%           
- Complexity     3762     3764    +2     
=========================================
  Files           405      405           
  Lines         11463    11464    +1     
  Branches       1396     1395    -1     
=========================================
+ Hits           8779     8780    +1     
  Misses         2201     2201           
  Partials        483      483           

Impacted Files	Coverage Δ	Complexity Δ
.../runtime/extension/builtin/ExecutionExtension.java	60.00% <100.00%> (ø)	2.00 <1.00> (ø)
...k/runtime/extension/builtin/IsolatedExtension.java	100.00% <100.00%> (ø)	3.00 <1.00> (ø)
...tension/builtin/ResourceLockChildrenExtension.java	100.00% <100.00%> (ø)	4.00 <2.00> (ø)
...ntime/extension/builtin/ResourceLockExtension.java	100.00% <100.00%> (ø)	4.00 <1.00> (ø)

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