Add the merge-function-set transform

[gregtatum]

This resolves #3761

For profiles with large amounts of merges:

• This makes the UI more reasonable by grouping the merges.
• The full profile load no longer kills the browser in how long it takes.
• There is a slight performance regression per merge, but not too bad. My numbers weren't very scientific.

Operation	Profile steps	Timing	URL
Merge function	load profile	11.6s	https://share.firefox.dev/32eRabC
Merge function set	load profile	0.2s	https://share.firefox.dev/3q8K0xG
Merge function	apply one transform	168ms	https://share.firefox.dev/3q3SXbx
Merge function set	apply one transform	218ms	https://share.firefox.dev/3GTaAlf

[codecov[bot]]

Codecov Report

Merging #3762 (1d10cdd) into main (2214df8) will decrease coverage by 0.00%. The diff coverage is 83.56%.

@@            Coverage Diff             @@
##             main    #3762      +/-   ##
==========================================
- Coverage   87.87%   87.86%   -0.01%     
==========================================
  Files         268      268              
  Lines       22403    22471      +68     
  Branches     5741     5763      +22     
==========================================
+ Hits        19686    19744      +58     
- Misses       2504     2514      +10     
  Partials      213      213              

Impacted Files	Coverage Δ
src/components/shared/CallNodeContextMenu.js	88.78% <0.00%> (-0.84%)	:arrow_down:
src/profile-logic/transforms.js	92.53% <81.63%> (-0.83%)	:arrow_down:
src/reducers/url-state.js	94.68% <95.23%> (-0.02%)	:arrow_down:
src/utils/flow.js	84.05% <100.00%> (+0.23%)	:arrow_up:
src/utils/uintarray-encoding.js	64.42% <0.00%> (+0.96%)	:arrow_up:

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[gregtatum]

I still plan on finishing this, was out of office for the holidays.

[flodolo]

Any update on this one? I'd like to at least get it out of my review queue if it's not relevant anymore ;-)

[julienw]

Any update on this one? I'd like to at least get it out of my review queue if it's not relevant anymore ;-)

I removed the r request for you until we finish it.