Generate gems RBIs for vendored gems

[Morriar]

Some projects use vendored gems, for example under the bundler/ directory.

Such gems don't appear in the Gemfile and thus Tapioca doesn't generate any RBI for them.

Since we generally exclude the vendored directory from type-checking, we're getting missing constants and methods.

We should find a way to make Tapioca generate RBI files for vendored gems.

[dirceu]

From Ufuk:

It looks like Tapioca does the right thing about vendored gems because we explicitly check for it:

tapioca/lib/tapioca/helpers/gem_helper.rb

Lines 16 to 19 in 3528c25

	sig { params(full_gem_path: String).returns(T::Boolean) }
	def gem_in_bundle_path?(full_gem_path)
	path_in_dir?(full_gem_path, Bundler.bundle_path) || path_in_dir?(full_gem_path, Bundler.app_cache)
	end

On the flip side, we should not be processing any gem that "lives" inside the repo, since it will be type-checked along with the repo itself anyway

I'm gonna go ahead and close this issue; we can reopen if we find a specific use case to replicate the problem.