Add support for partial indexes and concurrent indexes in postgres #809

Job	Run time
Windows - PHP 8.1 & SQL Server	3m 33s
testsuite-linux (8.1, mariadb)	1m 48s
testsuite-linux (8.1, mysql)	1m 9s
testsuite-linux (8.1, pgsql)	56s
testsuite-linux (8.1, sqlite)	53s
testsuite-linux (8.2, mariadb)	1m 47s
testsuite-linux (8.2, mysql)	1m 1s
cs-stan / Coding Standard & Static Analysis	46s
testsuite-linux (8.2, pgsql)	1m 2s
testsuite-linux (8.2, sqlite)	45s
testsuite-linux (8.3, mariadb)	1m 44s
testsuite-linux (8.3, mysql)	58s
testsuite-linux (8.3, pgsql)	1m 4s
testsuite-linux (8.3, sqlite)	52s
testsuite-linux (8.4, mariadb)	1m 32s
testsuite-linux (8.4, mysql)	1m 10s
testsuite-linux (8.4, pgsql)	1m 1s
testsuite-linux (8.4, sqlite)	44s
testsuite-linux (8.1, sqlite, prefer-lowest)	45s
testsuite-linux (8.1, sqlite, dev-5.next as 5.1.0)	59s
	24m 29s

Provide feedback