Add OAuth2 refresh_token support#705

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talatuyarer wants to merge 6 commits intoduckdb:mainfrom

talatuyarer:oauth-refresh-token

Commits on Feb 14, 2026

Refactor OAuth2 token management to improve thread safety by requiring a lock for token state checks and refresh operations.
talatuyarer
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Move tests to under oauth2 folder
talatuyarer
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