rename CombineObservable to ObservableCombine etc.

[beeth0ven]

rename CombineObservable to ObservableCombine etc.

[codecov]

Codecov Report

Merging #73 (73672f3) into main (84669f3) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main       #73   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           31        31           
  Lines          339       339           
=========================================
  Hits           339       339           

Impacted Files	Coverage Δ
lib/src/observables/observables/observable.dart	100.00% <100.00%> (ø)
...b/src/observables/observables/observable_cast.dart	100.00% <100.00%> (ø)
...rc/observables/observables/observable_combine.dart	100.00% <100.00%> (ø)
...src/observables/observables/observable_create.dart	100.00% <100.00%> (ø)
...c/observables/observables/observable_distinct.dart	100.00% <100.00%> (ø)
...ib/src/observables/observables/observable_map.dart	100.00% <100.00%> (ø)
.../observables/observables/observable_multicast.dart	100.00% <100.00%> (ø)
...b/src/observables/observables/observable_skip.dart	100.00% <100.00%> (ø)
.../src/observables/observables/observable_where.dart	100.00% <100.00%> (ø)

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