[Feature] [Dubbo-python] Optimize Documents

[cnzakii]

What is the purpose of the change

ISSUE: #15092

Brief changelog

This PR focuses on optimizing and improving the following documentation:

1. Update the packaging and release information for Dubbo Python, renaming it from dubbo-python to apache-dubbo in pyproject.toml.
2. Improve the .gitignore file.
3. Add development dependency installation instructions and testing guidelines to CONTRIBUTING.md.
4. Include badges, installation instructions, and the CONTRIBUTING section in README.md.

Verifying this change

Checklist

• Make sure there is a GitHub_issue field for the change (usually before you start working on it). Trivial changes like typos do not require a GitHub issue. Your pull request should address just this issue, without pulling in other changes - one PR resolves one issue.
• Each commit in the pull request should have a meaningful subject line and body.
• Write a pull request description that is detailed enough to understand what the pull request does, how, and why.
• Write necessary unit-test to verify your logic correction, more mock a little better when cross module dependency exist.
• Add some description to dubbo-website project if you are requesting to add a feature.
• GitHub Actions works fine on your own branch.
• If this contribution is large, please follow the Software Donation Guide.

[cnzakii]

@AlbumenJ PTAL