[WIP] Feature/token color trie

[akinsho]

Based off of #2565 this PR introduces a trie data structure to handle tokens read in from the theme, inspired by this vscode strategy
The reasoning being in summary, a trie allows us to resolve the complicated inheritance like pattern for tokens which is how textmate/vscode reads in themes e.g. if string is => { color: red, style: italic } and string.quoted is => { color: blue }, then when read out of the tree the settings for this will be { color: blue, style: italic // inherited } (simplification * 2)

Outstanding:

• there is some extra logic to how certain tokens inherit styles and the rules of precedence for tokens which are still unclear -> need to research and implement these here.

[codecov]

Codecov Report

Merging #2621 into master will increase coverage by 0.1%.
The diff coverage is 67.23%.

@@           Coverage Diff            @@
##           master   #2621     +/-   ##
========================================
+ Coverage    45.3%   45.4%   +0.1%     
========================================
  Files         361     362      +1     
  Lines       14571   14678    +107     
  Branches     1912    1930     +18     
========================================
+ Hits         6601    6665     +64     
- Misses       7746    7785     +39     
- Partials      224     228      +4

Impacted Files	Coverage Δ
browser/src/Editor/BufferHighlights.ts	16.66% <ø> (ø)	⬆️
...es/SyntaxHighlighting/SyntaxHighlightingReducer.ts	30.95% <0%> (-4.19%)	⬇️
browser/src/Editor/NeovimEditor/NeovimEditor.tsx	8.62% <0%> (ø)	⬆️
browser/src/Utility.ts	46.32% <0%> (-0.7%)	⬇️
...ices/SyntaxHighlighting/SyntaxHighlightingStore.ts	25.86% <0%> (-0.46%)	⬇️
browser/src/neovim/NeovimInstance.ts	5.47% <0%> (ø)	⬆️
...Services/SyntaxHighlighting/TokenThemeProvider.tsx	90.62% <100%> (ø)	⬆️
.../Services/SyntaxHighlighting/SyntaxHighlighting.ts	22.91% <25%> (-1%)	⬇️
browser/src/Services/TokenColorsTrie.ts	69.31% <69.31%> (ø)
browser/src/Services/TokenColors.ts	61.53% <77.77%> (+4.39%)	⬆️
... and 6 more

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