Add support for Snowflake account privileges

[yoavcloud]

This PR mostly handles the following part of the GRANT syntax on Snowflake: https://docs.snowflake.com/en/sql-reference/sql/grant-privilege

GRANT { globalPrivileges | ALL [ PRIVILEGES ] } ON ACCOUNT TO [ ROLE ] <role_name> [ WITH GRANT OPTION ]

[iffyio]

Thanks @yoavcloud! Left one minor comment

[iffyio]

Could we add a link to the docs for the introduced enums? I'm thinking since there's a lot of them, especially in the parsing code it'll be useful to know where the syntax is coming from for reference

[alamb]

Hi @yoavcloud -- thank you for all these PRs / features 🙏

Given you are so active in the project and now are quite familar with the code, perhaps you might be interested in helping review other contributor PRs as well? To do so just leave a review and then tag @iffyio and/or myself

The goal would would be to get the PR to point where we can just approve it and merge. I think the big things to check for would be test coverage and style consistency with the rest of the crate