Consolidate shared code into PdoAdapter #823

Job	Run time
Windows - PHP 8.1 & SQL Server	3m 26s
testsuite-linux (8.1, mariadb)	1m 33s
testsuite-linux (8.1, mysql)	1m 17s
testsuite-linux (8.1, pgsql)	54s
testsuite-linux (8.1, sqlite)	46s
testsuite-linux (8.2, mariadb)	1m 38s
testsuite-linux (8.2, mysql)	1m 15s
testsuite-linux (8.2, pgsql)	56s
testsuite-linux (8.2, sqlite)	52s
testsuite-linux (8.3, mariadb)	1m 35s
testsuite-linux (8.3, mysql)	1m 17s
testsuite-linux (8.3, pgsql)	57s
testsuite-linux (8.3, sqlite)	47s
testsuite-linux (8.4, mariadb)	1m 50s
testsuite-linux (8.4, mysql)	1m 7s
testsuite-linux (8.4, pgsql)	55s
testsuite-linux (8.4, sqlite)	46s
testsuite-linux (8.1, sqlite, prefer-lowest)	1m 10s
testsuite-linux (8.1, sqlite, dev-5.next as 5.1.0)	46s
cs-stan / Coding Standard & Static Analysis	46s
	24m 33s

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