Utils improvements

[josepot]

Lots of stuff in this PR:

• Get rid of the CollectedObservable
• Add the geGroupedObservable function, instead (I'm very open to suggestions for a better name :see_no_evil: )
• Get rid of the optional argument filter of the collect operator
• For a matter of performance and overall bundle-sizes: use a lot less rxjs operators

[codecov[bot]]

Codecov Report

Merging #168 (b2d5c5c) into main (df25aeb) will not change coverage. The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main      #168   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           23        24    +1     
  Lines          376       375    -1     
  Branches        48        46    -2     
=========================================
- Hits           376       375    -1     

Impacted Files	Coverage Δ
packages/utils/src/collect.ts	100.00% <100.00%> (ø)
packages/utils/src/collectValues.ts	100.00% <100.00%> (ø)
packages/utils/src/getGroupedObservable.ts	100.00% <100.00%> (ø)
packages/utils/src/internal-utils.ts	100.00% <100.00%> (ø)
packages/utils/src/split.ts	100.00% <100.00%> (ø)

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[josepot]

I can't believe that the bundle size went down! :thinking: