Relax Path Validation to Allow Any Percent-Encoded Sequence

[tustvold]

Is your feature request related to a problem or challenge? Please describe what you are trying to do.

The current validation performed by PathPart::parse and by extension Path::parse returns an error if the provided string does not round-trip. In particular it decodes the string, re-encodes it, and if the result does not equal the original string, it returns an error.

This is safe, but can lead to surprises when interacting with other systems. In particular it will return an error for:

• Percent-encoded sequences for characters object_store does not consider illegal Accessing a file with a percent-encoded name on the filesystem with ObjectStore LocalFileSystem #2349
• Paths that contain a % but not as part of a percent encoded sequence

Describe the solution you'd like

There is no reason not to permit these paths, especially in the former case where they are arguably more safe than the paths generated by object_store. To phrase it differently Path::parse should accept any "safe" path, even if it would not itself generate that path.

Describe alternatives you've considered

Additional context