Deprecate using the implicit default PgSQL connection

The DB connection should be provided in all cases as the first argument.
The overloaded function signatures will be removed in the f

Deprecate using the implicit default PgSQL connection

The DB connection should be provided in all cases as the first argument.
The overloaded function signatures will be removed in the future.
Warn about this change.

Part of https://wiki.php.net/rfc/deprecations_php_8_1.

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Add some missing EXTENSIONS sections to misc tests

Convert resources to objects in ext/pgsql

Closes GH-6791

Co-authored-by: Nikita Popov <nikita.ppv@gmail.com>

Promote pgsql no link to Error exception