Allow adding session tracks to embedded react component along with disableAddTracks option if unwanted

[cmdcolin]

I made it so the embedded react LGV component has the ability to add session tracks, along with a flag "disableAddTracks" to optionally disable it. "disableAddTracks" is off by default.

I also made it so that extension points can be evaluated with a second "props" argument. This allows passing the session model to the extension point, and it does not have to participate in the "accumulator" pipeline (before this, the only way to pass information to extension points is via the accumulator param which is subsequently returned by each extension point). This allows e.g. checking that the TrackSelect-multiTrackMenuItems extension point should add a multi-wiggle add track widget by checking the new extra session prop

Fixes #3205 (The sequence search track uses session tracks for example, and assumed it existed always, but this is not always true)

[codecov]

Codecov Report

Merging #3223 (36d9e36) into main (85c73a5) will increase coverage by 0.00%.
The diff coverage is 31.37%.

@@           Coverage Diff           @@
##             main    #3223   +/-   ##
=======================================
  Coverage   59.42%   59.42%           
=======================================
  Files         672      672           
  Lines       28752    28772   +20     
  Branches     6977     6984    +7     
=======================================
+ Hits        17086    17098   +12     
- Misses      11387    11393    +6     
- Partials      279      281    +2     

Impacted Files	Coverage Δ
...rarchicalTrackSelectorWidget/components/Header.tsx	42.85% <ø> (ø)
plugins/wiggle/src/index.ts	92.50% <ø> (ø)
...-genome-view/src/createModel/createSessionModel.ts	18.23% <15.38%> (+0.23%)	⬆️
...ins/wiggle/src/CreateMultiWiggleExtension/index.ts	25.92% <20.00%> (+7.74%)	⬆️
.../linear-genome-view/src/LinearGenomeView/index.tsx	83.04% <33.33%> (-0.26%)	⬇️
packages/core/PluginManager.ts	92.40% <100.00%> (ø)
packages/core/util/types/index.ts	67.46% <100.00%> (+0.39%)	⬆️
...-linear-genome-view/src/createModel/createModel.ts	62.50% <100.00%> (ø)
...se-react-linear-genome-view/src/createViewState.ts	50.00% <100.00%> (+2.00%)	⬆️
...ments/src/SNPCoverageAdapter/SNPCoverageAdapter.ts	58.00% <0.00%> (+0.66%)	⬆️
... and 2 more

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