[CIR] Provide syntax highlighting support of clang ir for vim/nvim users

[badumbatish]

Hi there, I'm opening the PR to add syntax highlighting support for vim and neovim users.

The PR borrows a lot from MLIR but also add

• Dedicated CIR types like bytes
• Dedicated CIR keywords(?!) like coroutine, resume, suspend, etc etc.
• Blanket operation highlighting for CIR operations (No need to edit syntax/cir.vim again for new operations)

Below is the before and after of applying syntax highlighting.

Before:

After:

[badumbatish]

@AmrDeveloper you might like this

[bcardosolopes]

Awesome, thanks for caring about these things!
LGTM, happy when @AmrDeveloper approves this. Also if you'd like to add some docs to clangir.org it's just one PR away in the gh-pages branch!

[badumbatish]

i forgot to add CIR: to highlighting before pushing, will do this later

[AmrDeveloper]

Thanks for updating the syntax file. I have some suggestions, and later we can update the file when we have a new keyword

[AmrDeveloper]

LGTM, Thanks

[badumbatish]

thanks Amr for the reviews