[Cangjie] Add new service

[Zxilly]

Implemented a new Cangjie service for the Cangjie package ecosystem to provide version badges.
This PR adds the base service, version badge endpoint, and related tests.

[github-actions]

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📖	✨ Thanks for your contribution to Shields, @Zxilly!

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[PyvesB]

Hello @Zxilly ! 👋🏻 Thanks for the contribution! Is there any documentation on the registry API? Would there be a way to get a native JSON response?

[Zxilly]

Sorry, this document is available only in Chinese. https://pkgdocs.cangjie-lang.cn/docs/zh/1.0.0/central-repo/source_zh_cn/appendix/api.html

[Zxilly]

Some curl command can be used as test.

curl -L -sS "https://pkg.cangjie-lang.cn/registry/index/un/ic/unicode_case"

curl -L -sS "https://pkg.cangjie-lang.cn/registry/index/f_/st/f_store?organization=fountain"

[PyvesB]

I'm not seeing any information on rate-limits. Are there any constraints on the usage of this API?

[Zxilly]

The official documentation does not provide specific rate limit values, but based on my own testing, the API continues to function normally even when the RPS exceeds 100. Since the service that supports index queries appears to be an object storage system, I suspect that even if there is a rate limit, it must be set to a very high value.

[PyvesB]

Okay, I'd say it's acceptable to move forward with this API. Could you switch from BaseService to BaseJsonService?

[Zxilly]

The index method returns data in JSONL format rather than JSON, so I think it will be difficult to migrate to BaseJsonService.

[jNullj]

Should we make a new base-jsonl base service here?
I don't mind adding a pr and you rebase from it, or you can add it yourself in this PR (see core/base-json for context.
This will provide cleaner code and fall into our existing boilerplate.
Also useful for future code reuse if any other service needs jsonl.

[Zxilly]

I will add a base-jsonl service