Convert bemuse-notechart and bemuse-indexer to TypeScript

[dtinth]

This PR

• Convert bemuse-notechart to TypeScript
• Convert bemuse-indexer to TypeScript

[codecov-io]

Codecov Report

Merging #522 into master will decrease coverage by 0.66%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #522      +/-   ##
==========================================
- Coverage   82.04%   81.38%   -0.67%     
==========================================
  Files         167      153      -14     
  Lines        5129     4619     -510     
  Branches       68       68              
==========================================
- Hits         4208     3759     -449     
+ Misses        903      842      -61     
  Partials       18       18

Impacted Files	Coverage Δ
packages/bms/src/index.ts	100% <ø> (ø)	⬆️
packages/bms/src/notes/index.ts	94.11% <100%> (ø)	⬆️
packages/bms/src/compiler/index.ts	64.44% <100%> (ø)	⬆️

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