utils: decode redirect target

[carantunes]

Fixes: #203

[slint]

LGTM! Just out of curiosity can you post how the output was before the fix for the test case you added?

Also, do you need a release for this one? You can then also push a patch version commit, i.e. v1.2.1, like this one: aee0453

[carantunes]

Previously
/oauth/authorize?redirect_uri=http%3A%2F%2F127.0.0.1%3A5100%2Fauthorized
was being transformed into
oauth/authorize?redirect_uri=http%253A%252F%252F127.0.0.1%253A5100%252Fauthorized

Should I commit the patch version commit into this PR as well?

[slint]

Thanks for the example, indeed it's super weird that it got serialized like this...

Should I commit the patch version commit into this PR as well?

Yes, but put it in a separate commit with a release: v1.2.1 message (like the one I linked for v1.2.0).

[carantunes]

Done @slint