Add a command-line option to use PyPI mirror during resolving dependcies

[mnixry]

• I have searched the issues of this repo and believe that this is not a duplicate.
• I have searched the documentation and believe that my question is not covered.

Feature Request

In some country such as China, the native PyPI source speed is extremely slow, so most of Chinese users had to choice some mirror of PyPI to alter the default pypi.org settings.

poetry/poetry/repositories/pypi_repository.py

Lines 48 to 72 in de0b32c

	def __init__(self, url="https://pypi.org/", disable_cache=False, fallback=True):
	super(PyPiRepository, self).__init__(url.rstrip("/") + "/simple/")
	self._base_url = url
	self._disable_cache = disable_cache
	self._fallback = fallback
	release_cache_dir = REPOSITORY_CACHE_DIR / "pypi"
	self._cache = CacheManager(
	{
	"default": "releases",
	"serializer": "json",
	"stores": {
	"releases": {"driver": "file", "path": str(release_cache_dir)},
	"packages": {"driver": "dict"},
	},
	}
	)
	self._cache_control_cache = FileCache(str(release_cache_dir / "_http"))
	self._session = CacheControl(
	requests.session(), cache=self._cache_control_cache
	)
	self._name = "PyPI"

According the code, it's seems possible to change the site domain, but unfortunately this argument is not been used in anywhere.
I hope to add a global option to change the pypi domain instead of add a hard-coded config in pyprojce.toml file, because different mirror speed will be different in different region, I don't think directly submitted to the Git repository and forced all users to use a same mirror is a wise choice.

related: #3552 #3261

[sinoroc]

We should probably close this ticket in favor of #3479 (or maybe there is an other, even more complete ticket).

[sinoroc]

@mnixry There is a PR that could solve this issue. Would you be able to test it, give feedback? #3624

[dimbleby]

this probably wants absorbing into #6713

[neersighted]

This is actually a duplicate of #1632 instead. Thanks for spotting it!

[github-actions]

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