Migrate SKIPIF -> EXTENSIONS (#7138)

This is an automated migration of most SKIPIF extension_loaded checks.

Support native types in PDO SQLite

Return integers and floats as native types if possible. As usual,
the old behavior can be restored by enabling ATTR_STRINGIFY_FETCHES.

Fixes b

Support native types in PDO SQLite

Return integers and floats as native types if possible. As usual,
the old behavior can be restored by enabling ATTR_STRINGIFY_FETCHES.

Fixes bug #38334.

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