TN-57749 - Future-proof Python SDK PII configuration

[Travmatth]

What changed

• Bumps the Python SDK version from 3.21.0 to 3.22.0.
• Preserves unrecognized PII labels decoded from Solar dataset settings and permits those server-supplied labels when the settings are copied back to Solar.
• Accepts built-in generator-config labels and PII-state values case-insensitively, then sends Solar canonical casing (for example, name_given: redaction becomes NAME_GIVEN: Redaction).
• Keeps validation for unknown labels that a caller supplies directly, so ordinary typos still fail locally.

Why

Solar can introduce PII labels independently of the SDK release cadence. Previously, an SDK that decoded a newer server configuration would reject that same configuration when a caller copied or edited a dataset. Case-sensitive configuration also made integrations brittle despite Solar using canonical labels.

Validation

• pytest tests/tests/test_future_pii_compatibility.py tests/tests/test_pii_type_catalog.py -q
• ruff check tonic_textual/generator_utils.py tests/tests/test_future_pii_compatibility.py