test(format/uri): add strict anchoring, spacing, and delimiter validation cases

[AcEKaycgR]

Applies to: draft-v1, draft-04, draft-06, draft-07, draft/2019-09, draft/2020-12

Adds 9 new cases validating strict string anchoring constraints, disallowed whitespace characters (newlines, spaces), and invalid path/authority delimiters for the uri format.

Added:

• Trailing newline after valid URI (invalid)
• Embedded newline inside URI (invalid)
• Space inside query (invalid)
• Space inside fragment (invalid)
• Close brace } inside path (invalid)
• Raw non-ASCII emoji inside path (invalid)
• Open brace { inside query (invalid)
• Open brace { inside fragment (invalid)
• Multiple @ signs in authority (invalid)

Ecosystem Impact (Triangulation):

Under Bowtie verification against 8 active implementations, these cases successfully caught live compliance issues:

1. PHP Bug Caught: php-opis-json-schema incorrectly accepts trailing newlines ("http://a.com\n") and embedded newlines ("http://a\n.com") as valid.
2. Go Bug Caught: go-gojsonschema incorrectly accepts spaces in query ("?a b") and fragment ("#a b").
3. Go Bug Caught: go-gojsonschema incorrectly accepts invalid braces ({ and }) in path, query, and fragment.
4. Go Bug Caught: go-gojsonschema incorrectly accepts multiple @ signs in authority ("http://user@pass@a.com").

@jviotti @jdesrosiers @karenetheridge Ready for review.

[jviotti]

This seems very similar to the one in line 165?

[AcEKaycgR]

Good catch and thank you I've removed the redundant "close brace is invalid in path" test case since it is already covered by the existing {} test on line 165.

[jviotti]

Looks good to me, though there is one test I commented on that I think is already well covered by the rest?