feat(operators): Add signature based on parameters collection

[DiedrikDM]

Resolve signature from name, parameters and return type values as per #168. This change includes an update to the OperatorDoc type, because the return type of every operator needed to be included. All existing operators have been updated as well to include the correct return type. Some updates to the css were required to add colors to the signature. Added a new pipe (ArgumentPipe) to create a nice tooltip when hovering over the arguments.

[codecov-io]

Codecov Report

Merging #284 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #284   +/-   ##
=======================================
  Coverage   90.78%   90.78%           
=======================================
  Files         116      116           
  Lines         445      445           
  Branches        9        9           
=======================================
  Hits          404      404           
  Misses         40       40           
  Partials        1        1

Impacted Files	Coverage Δ
src/operator-docs/combination/mergeAll.ts	100% <ø> (ø)	:arrow_up:
src/operator-docs/transformation/partition.ts	100% <ø> (ø)	:arrow_up:
src/operator-docs/transformation/bufferCount.ts	100% <ø> (ø)	:arrow_up:
src/operator-docs/combination/concatAll.ts	100% <ø> (ø)	:arrow_up:
src/operator-docs/combination/startWith.ts	100% <ø> (ø)	:arrow_up:
src/operator-docs/filtering/take.ts	100% <ø> (ø)	:arrow_up:
src/operator-docs/filtering/debounce.ts	100% <ø> (ø)	:arrow_up:
src/operator-docs/transformation/window.ts	100% <ø> (ø)	:arrow_up:
src/operator-docs/transformation/switchMap.ts	100% <ø> (ø)	:arrow_up:
src/operator-docs/combination/withLatestFrom.ts	100% <ø> (ø)	:arrow_up:
... and 34 more

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[niklas-wortmann]

First of all thanks for this much work! I will take a look at this pr and give some feedback.

[DiedrikDM]

@JWO719 I'm also pretty sure that a more UX proficient person (than me) should look at it. I made a couple of choices right now in the implementation, like colors and a tooltip that maybe could/should be done in an other way...

[ashwin-sureshkumar]

@DiedrikDM - please resolve conflicts