ReadPath regex in files.stone does not match U+2028 in filename

**Describe the bug**
https://github.com/dropbox/dropbox-sdk-java/issues/490
This issue was reported in the dropbox java sdk.

**To Reproduce**
Attempt to call `getMetadata` with a filename that has U+2028 in it. It will fail to match the regex and throw java.lang.IllegalArgumentException: String 'path' does not match pattern.

If you attempt to escape the Unicode character, the server returns a malformed path error.

**Expected Behavior**
Files with a valid path would match the regex and return the file metadata.

**Actual Behavior**
java.lang.IllegalArgumentException: String 'path' does not match pattern.
or
Malformed path error from the server

**Versions**
* What version of the Stone are you using? Latest stone, latest api spec from Sep 1, 2022
* What version of the language are you using? Java
* What platform are you using? (if applicable) Dropbox Java Sdk

**Additional context**
I think the fix is as simple as changing the regex to
`(/(.|[\r\n\u2028])*|id:.*)|(rev:[0-9a-f]{9,})|(ns:[0-9]+(/.*)?)`
in files.stone but would like somebody with more stone experience to chime in.

Start in files.stone at the ReadPath regex and reproduce the getMetadata case with a filename containing U+2028. Compare the regex behavior with the proposed change, then verify that valid paths match without triggering the malformed path error.

Written by the indexing model from the issue text.