[bug] TSX syntax highlighting

[haaarshsingh]

describe the bug

TSX (React TypeScript) syntax doesn't work at all.

to reproduce
steps to reproduce the behavior:

1. go to https://paste.myst.rs/
2. click on select language
3. scroll down to TSX
4. paste TSX code
5. hit paste
6. see no highlighting

expected behavior

Properly higlight the code.

device and browser:

• os: Linux
• browser: Brave
• browser version: 1.18.70 Chromium: 87.0.4280.101 (Official Build) (64-bit)

[CodeMyst]

when loading the tsx mode javascript and xml modes should also get loaded, similarly to this: https://github.com/CodeMyst/pastemyst/blob/main/public/scripts/pages/paste.js#L208-L212

should also be done in history.js and pastyEditor.js