fix: complete ADBC UUID and Oracle JSON round trips

[cofin]

Summary

• decode PostgreSQL ADBC arrow.opaque UUID scalar and list columns into stdlib uuid.UUID values for row APIs while preserving Arrow-native results
• add schema-decision caching, buffered/stream parity, disabled-gate behavior, and non-PostgreSQL no-op coverage
• bind direct Python JSON values on Oracle 12c–20c through UTF-8 BLOB IS JSON locators while retaining native DB_TYPE_JSON behavior on 21c+
• share the pool-scoped Oracle version cache across execute, execute-many, and streaming paths without per-bind metadata queries
• centralize UUID parsing/reconstruction in sqlspec.utils.uuids, using Rust parsing when available while preserving stdlib UUID driver compatibility
• remove pass-through Oracle bind copies and repeated storage resolution from the new JSON coercion path

[codecov-commenter]

Codecov Report

❌ Patch coverage is 85.05338% with 42 lines in your changes missing coverage. Please review.
✅ Project coverage is 77.18%. Comparing base (ffcfcfa) to head (e28a167).

Files with missing lines	Patch %	Lines
sqlspec/adapters/oracledb/core.py	77.77%	24 Missing and 14 partials ⚠️
sqlspec/adapters/oracledb/data_dictionary.py	81.81%	1 Missing and 1 partial ⚠️
sqlspec/utils/uuids.py	80.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #659      +/-   ##
==========================================
+ Coverage   77.14%   77.18%   +0.04%     
==========================================
  Files         475      475              
  Lines       67529    67750     +221     
  Branches     9241     9308      +67     
==========================================
+ Hits        52092    52290     +198     
- Misses      12034    12047      +13     
- Partials     3403     3413      +10     

Flag	Coverage Δ
integration	60.78% <69.75%> (+0.01%)	⬆️
py3.10	75.48% <85.05%> (+0.04%)	⬆️
py3.11	75.50% <85.05%> (+0.05%)	⬆️
py3.12	75.50% <85.05%> (+0.03%)	⬆️
py3.13	75.50% <85.05%> (+0.04%)	⬆️
py3.14	76.38% <85.05%> (+0.05%)	⬆️
unit	64.68% <82.20%> (+0.09%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
sqlspec/adapters/adbc/core.py	82.65% <100.00%> (+0.02%)	⬆️
sqlspec/adapters/adbc/driver.py	79.02% <100.00%> (ø)
sqlspec/adapters/bigquery/driver.py	81.06% <100.00%> (+4.03%)	⬆️
sqlspec/adapters/duckdb/core.py	87.04% <100.00%> (ø)
sqlspec/adapters/oracledb/_json_handlers.py	83.87% <100.00%> (-2.00%)	⬇️
sqlspec/adapters/oracledb/_param_types.py	100.00% <ø> (ø)
sqlspec/adapters/oracledb/_uuid_handlers.py	91.11% <100.00%> (+0.20%)	⬆️
sqlspec/adapters/oracledb/adk/store.py	62.15% <ø> (ø)
sqlspec/adapters/oracledb/config.py	92.70% <100.00%> (+1.04%)	⬆️
sqlspec/adapters/oracledb/driver.py	72.64% <100.00%> (ø)
... and 9 more

... and 1 file with indirect coverage changes

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