Hierarchical scopes

It would be interesting if it could be defined a hierarchical order for the scopes, that way, if I make git > git_banch, when I'm on git_branch scope, I could use git_branch's AND git's tags. That way, it there are files very "popular" on a git repo, I could leave them on git scope and still jump to them when on git_branch scope.

No files, tests, or entry points are named. Start by locating how grapple.nvim defines scopes and resolves tags, then determine the inheritance behavior and edge cases for nested scopes; done means a documented, tested hierarchy where a child scope can use its own and its parent scope's tags.

Written by the indexing model from the issue text.