feature: Support italics

[smit4k]

Did you check the docs?

• I have read all the docs

Is your feature request related to a problem? Please describe.

Italics are currently not handled in the generator

Describe the solution you'd like

Use italic data from JSON produced by lua to render Italics (by using an italic font alongside the regular font)

Describe alternatives you've considered

N/A

Additional context

No response

[smit4k]

As well as other tex features

[smit4k]

Right now we're not fully picking up on the symbol groups like italics and undercurls