Add `offset` as keyword

[juliusv]

Currently support for completion and highlighting for offset is missing:

• foo offset 7d
• foo[5m] offset 7d

This should probably be added as a keyword?

[celian-garcia]

Hi Julius !
I am sorry, the watching was not activated, I don't know why ! Now I activated it.

I will have a look it's probably not complex.

Thanks for the issue !

[juliusv]

Thanks :)