github: add issue template to encourage reporting meta-rust version
github: add issue template to encourage reporting meta-rust version

I don't think we really need much structure, but in many cases
establishing the version of meta-rust which contains the issue is very
helpful in resolving it.

This makes it so the issue-reporter is at least given a field which
asks for the version.

meta-rust/meta-rust,starlab-io/meta-rust,cardoe/meta-rust,meta-rust/meta-rust,starlab-io/meta-rust,cardoe/meta-rust,meta-rust/meta-rust,cardoe/meta-rust,meta-rust/meta-rust,meta-rust/meta-rust,cardoe/meta-rust