Fix httpx is not encoding with symbol '%s' (#3140)

[Tunglies]

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Fix httpx is not encoding with symbol '%s' (#3140) Add url parsing test

Summary

Checklist

• [x] I understand that this PR may be closed in case there was no previous discussion. (This doesn't apply to typos!)
• [x] I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• [ ] I've updated the documentation accordingly.

[heysarthak]

Hi @T-256, will the code change encode every "%" sent into uri as "%25" ?

[T-256]

Hi @T-256, will the code change encode every "%" sent into uri as "%25" ?

Yes, if it is invalid percent-encoded.

[heysarthak]

when can we merge this changes? @tomchristie

[jhominal]

Hello, could you look at if this PR fixes the cases of bad % character encoding that are raised in https://github.com/encode/httpx/discussions/3135?

I think the change in this PR (to only encode % if it would result in invalid percent-encoding) is a distraction from the real issue.

[lovelydinosaur]

Thanks. I think this is superseeded by #3187.

[heysarthak]

I tried the same on http 0.27.0, still having the same issue.