Support `edition` keyword

[kansson]

Hi 👋🏻

I'm testing protobuf editions and the lsp complains about the keyword.
Editions is a big topic so maybe we can start small and only add support for the keyword?

[asharkhan3101]

Yeah this is related to the tree sitter parser. I believe, I can work on that here: https://github.com/coder3101/tree-sitter-proto

[kansson]

Yeah this is related to the tree sitter parser. I believe, I can work on that here: https://github.com/coder3101/tree-sitter-proto

Thank you, would like to help but I'm not familiar with how tree sitter works.

[coder3101]

coder3101/tree-sitter-proto#1 added support for edition. I am going to drop this to master now.