Add Full WebPack Support

[Danielku15]

Issues

Fixes #1348

Proposed changes

• Reorganize compile outputs as planned
• Adjust compilation pipeline (use rollup typescript)
• Change playground to use ESM
• Implement webpack plugin which configures output and audio worklet handling.

Checklist

• [x] I consent that this change becomes part of alphaTab under it's current or any future open source license
• [x] Changes are implemented
• [x] Existing builds tests pass
• [x] New tests were added

Further details

• [ ] This is a breaking change
• [x] This change will require update of the documentation/website