Update bundled transpileModule implementation to match latest TS codebase

[cspotcode]

Fixes #1971

Implementation notes

We have a bundled copy of TS's transpileModule because we needed to make a couple tweaks that couldn't be done via public API.

Those differences are:

• Refactored into createTsTranspileModule which returns impl of transpileModule
  • ingest compiler options once, not on every single call to transpileModule
• useCaseSensitiveFileNames changed from false to true
• fileExists and readFile understand to return a package.json so that module: NodeNext emits correctly
  • local var packageJsonFileName added as part of this

[codecov]

Codecov Report

Merging #1973 (50ffdb4) into main (fd43821) will decrease coverage by 0.12%.
The diff coverage is 100.00%.

Impacted Files	Coverage Δ
src/ts-transpile-module.ts	76.36% <100.00%> (-0.11%)	⬇️

... and 2 files with indirect coverage changes