perf: faster blobless git clones

Cloning a repo with git can be really slow if the repo is big.

Adding `--filter=blob:none` to the `git clone` command will make it really faster and slimmer because it will lazy-download blobs on checkout, while only getting commit metadata for whatever is not checked out.

See "Blobless Clones" in https://github.blog/2020-12-21-get-up-to-speed-with-partial-clone-and-shallow-clone/ for a good explanation.

Also interesting to see that pip 21.3 itself landed this enhancement: pypa/pip#9086.

@moduon MT-83

poetry/core/vcs/git.py

@@ -259,7 +259,14 @@ def config(self):  # type: () -> GitConfig
     def clone(self, repository, dest):  # type: (str, Path) -> str
         self._check_parameter(repository)
 
-        return self.run("clone", "--recurse-submodules", "--", repository, str(dest))
+        return self.run(
+            "clone",
+            "--filter=blob:none",
+            "--recurse-submodules",
+            "--",
+            repository,
+            str(dest),
+        )
 
     def checkout(self, rev, folder=None):  # type: (str, Optional[Path]) -> str
         args = []