Add multi rev support for function `describe`

[karajan1001]

In our current describe function we only accept one rev at a time and will try to get a reference for every reference in the repo. It will cost O(MN) in exp show in which we try to get a ref for every single experiment.

scmrepo/src/scmrepo/git/backend/dulwich/__init__.py

Lines 725 to 740 in ed17985

	def _describe(
	self,
	rev: str,
	base: Optional[str] = None,
	match: Optional[str] = None,
	exclude: Optional[str] = None,
	) -> Optional[str]:
	if not base:
	base = "refs/tags"
	for ref in self.iter_refs(base=base):
	if (match and not fnmatch.fnmatch(ref, match)) or (
	exclude and fnmatch.fnmatch(ref, exclude)
	):
	continue
	if self.get_ref(ref, follow=False) == rev:
	return ref