feat(concurrentConcatAll): Add custom operator for managing multiple concurrent inner subscriptions but maintaining the output order

[zakhenry]

Closes #22

[zakhenry]

This needs to happen before merging

[codecov]

Codecov Report

Merging #26 into master will decrease coverage by 70.7%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##           master      #26       +/-   ##
===========================================
- Coverage     100%   29.29%   -70.71%     
===========================================
  Files           5        6        +1     
  Lines          73       99       +26     
  Branches       13       18        +5     
===========================================
- Hits           73       29       -44     
- Misses          0       70       +70

Impacted Files	Coverage Δ
...ervable-webworker/src/lib/concurrent-concat-all.ts	100% <100%> (ø)
...ojects/observable-webworker/src/lib/from-worker.ts	0% <0%> (-100%)	⬇️
...rojects/observable-webworker/src/lib/run-worker.ts	0% <0%> (-100%)	⬇️
...s/observable-webworker/src/lib/from-worker-pool.ts	0% <0%> (-100%)	⬇️
...e-webworker/src/lib/observable-worker.decorator.ts	0% <0%> (-100%)	⬇️

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[zakhenry]

Looks like the internals of RxJS has moved with v7, and there is now a common merge operator that will make it easier to implement in core.