Add support for partial indexes and concurrent indexes in postgres #807

Job	Run time
testsuite-linux (8.1, mariadb)	1m 43s
Windows - PHP 8.1 & SQL Server	3m 12s
testsuite-linux (8.1, mysql)	1m 8s
testsuite-linux (8.1, pgsql)	48s
testsuite-linux (8.1, sqlite)	55s
testsuite-linux (8.2, mariadb)	1m 31s
testsuite-linux (8.2, mysql)	1m 4s
cs-stan / Coding Standard & Static Analysis	59s
testsuite-linux (8.2, pgsql)	49s
testsuite-linux (8.2, sqlite)	47s
testsuite-linux (8.3, mariadb)	1m 31s
testsuite-linux (8.3, mysql)	1m 6s
testsuite-linux (8.3, pgsql)	1m 0s
testsuite-linux (8.3, sqlite)	44s
testsuite-linux (8.4, mariadb)	1m 28s
testsuite-linux (8.4, mysql)	58s
testsuite-linux (8.4, pgsql)	58s
testsuite-linux (8.4, sqlite)	43s
testsuite-linux (8.1, sqlite, prefer-lowest)	51s
testsuite-linux (8.1, sqlite, dev-5.next as 5.1.0)	46s
	23m 1s

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