fix/add date-related functions#643

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IoannaNika wants to merge 3 commits intoduckdb:mainfrom

IoannaNika:add_date_functions

Commits on Oct 15, 2025

fix/add clock functions and corresponding tests
IoannaNika
committed
Update tests/testthat/test-backend-dbplyr__duckdb_connection.R

krlmlr
authored and
IoannaNika
committed
changes + updates from previous PR (date_build, difftime)
IoannaNika
committed