Implement potentially strip spaces for opaque paths

[CYBAI]

This will fix https://github.com/servo/rust-url/issues/812.

[codecov-commenter]

Codecov Report

Base: 83.11% // Head: 83.20% // Increases project coverage by +0.08% :tada:

Coverage data is based on head (fdbe16c) compared to base (dbe60a4). Patch coverage: 100.00% of modified lines in pull request are covered.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #813 +/- ## ========================================== + Coverage 83.11% 83.20% +0.08% ========================================== Files 20 20 Lines 3275 3286 +11 ========================================== + Hits 2722 2734 +12 + Misses 553 552 -1 ``` | [Impacted Files](https://codecov.io/gh/servo/rust-url/pull/813?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Servo) | Coverage Δ | | |---|---|---| | [url/src/lib.rs](https://codecov.io/gh/servo/rust-url/pull/813?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Servo#diff-dXJsL3NyYy9saWIucnM=) | `76.35% <100.00%> (+0.35%)` | :arrow_up: | | [data-url/tests/wpt.rs](https://codecov.io/gh/servo/rust-url/pull/813?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Servo#diff-ZGF0YS11cmwvdGVzdHMvd3B0LnJz) | `85.71% <0.00%> (+1.29%)` | :arrow_up: | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Servo). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Servo)

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[valenting]

Thank you!