support for rust language highlighting

[jianshu93]

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

support for a very popular language

Describe the solution you'd like

Rust as the most loved language since 2020, widely used. Add language source for Rust will be very useful, it was considered a good replacement for C++

Describe alternatives you've considered

nothing, check the Lapce editor (https://lapce.dev)

Additional context

no

[lukepistrol]

Moving this to CodeEditLanguages

[lukepistrol]

Rust should already be implemented. See #10 for missing languages.

[lukepistrol]

Closing this since it already is implemented