Request for adding PEG grammar from Rust pest crate

[equt]

What is the name of this language in Linguist?

It does not occur in the list.

Link to GitHub repository of Vim plugin

https://github.com/pest-parser/pest.vim

Is this plugin well maintained?

Yes, it seems to be maintained by the official.

Is this plugin lightweight? (no advanced functionality, just indent and syntax support)

Yes