Use cakephp/database for postgres schema reflection #816

Job	Run time
Windows - PHP 8.1 & SQL Server	2m 39s
testsuite-linux (8.1, mariadb)	1m 35s
testsuite-linux (8.1, mysql)	1m 7s
testsuite-linux (8.1, pgsql)	54s
testsuite-linux (8.1, sqlite)	44s
cs-stan / Coding Standard & Static Analysis	58s
testsuite-linux (8.2, mariadb)	1m 37s
testsuite-linux (8.2, mysql)	1m 4s
testsuite-linux (8.2, pgsql)	57s
testsuite-linux (8.2, sqlite)	44s
testsuite-linux (8.3, mariadb)	1m 31s
testsuite-linux (8.3, mysql)	1m 19s
testsuite-linux (8.3, pgsql)	54s
testsuite-linux (8.3, sqlite)	58s
testsuite-linux (8.4, mariadb)	1m 45s
testsuite-linux (8.4, mysql)	1m 16s
testsuite-linux (8.4, pgsql)	1m 4s
testsuite-linux (8.4, sqlite)	45s
testsuite-linux (8.1, sqlite, prefer-lowest)	45s
testsuite-linux (8.1, sqlite, dev-5.next as 5.1.0)	53s
	23m 29s

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