Support retrieving name and repo-url from credentials if not provided

[ischaojie]

Add the ability to automatically get the repository-url and username from the credentials configuration.

If repository-url or username is either not provided, try to get it from the credentials configuration, or provide the default value if it is not available.

Then, you just need to execute rye publish -r testpypi each time.

A simple test:

➜  o git:(main) ✗ rye publish -r testpypi
Uploading distributions to https://test.pypi.org/legacy/
Uploading o-0.1.0-py3-none-any.whl
100% ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 3.6/3.6 kB • 00:00 • ?
WARNING  Error during upload. Retry with the --verbose option for more details.
ERROR    HTTPError: 400 Bad Request from https://test.pypi.org/legacy/
         The name 'o' is too similar to an existing project. See https://test.pypi.org/help/#project-name for more information.
Error: failed to publish files
➜  o git:(main) ✗ cat ~/.rye/credentials
[pypi]
token = "......"
repository-url = "https://upload.pypi.org/legacy/"
username = "__token__"

[testpypi]
token = "......"
repository-url = "https://test.pypi.org/legacy/"
username = "__token__"