Discover unique indexes (#133) #664

Job	Run time
Clippy	1m 0s
Compile Postgres (live/postgres)	1m 1s
Compile MySQL (live/mysql)	1m 8s
Compile Postgres (discovery/postgres)	1m 3s
Compile SQLite (live/sqlite)	1m 1s
Compile MySQL (discovery/mysql)	1m 5s
Compile Postgres (writer/postgres)	54s
Rustfmt	13s
Compile SQLite (discovery/sqlite)	51s
Compile MySQL (writer/mysql)	1m 2s
Compile SQLite (writer/sqlite)	1m 8s
Unit Test	1m 16s
Postgres (14.4, live/postgres)	1m 2s
Postgres (14.4, discovery/postgres)	58s
Postgres (14.4, writer/postgres)	1m 5s
SQLite (live/sqlite)	20s
SQLite (discovery/sqlite)	19s
SQLite (writer/sqlite)	22s
MariaDB (10.6, live/mysql)	41s
MySQL (8, live/mysql)	46s
MariaDB (10.6, discovery/mysql)	47s
MySQL (8, discovery/mysql)	45s
MariaDB (10.6, writer/mysql)	42s
MySQL (8, writer/mysql)	35s
MySQL (5.7, live/mysql)	46s
MySQL (5.7, discovery/mysql)	45s
MySQL (5.7, writer/mysql)	43s
	22m 18s

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