feat(mysql): add support for vector indices (#139) #695

Job	Run time
Clippy	1m 6s
Unit Test	1m 21s
Compile Postgres (live/postgres)	1m 14s
Compile MySQL (live/mysql)	1m 14s
Compile Postgres (discovery/postgres)	1m 3s
Rustfmt	11s
Compile MySQL (discovery/mysql)	1m 7s
Compile SQLite (live/sqlite)	1m 9s
Compile Postgres (writer/postgres)	1m 5s
Compile MySQL (writer/mysql)	1m 4s
Compile SQLite (discovery/sqlite)	1m 7s
Compile SQLite (writer/sqlite)	1m 9s
MariaDB (10.6, live/mysql)	56s
MySQL (8, live/mysql)	57s
MariaDB (10.6, discovery/mysql)	53s
MySQL (8, discovery/mysql)	56s
MariaDB (10.6, writer/mysql)	47s
MySQL (8, writer/mysql)	53s
MySQL (5.7, live/mysql)	57s
MySQL (5.7, discovery/mysql)	41s
MySQL (5.7, writer/mysql)	46s
Postgres (14.4, live/postgres)	1m 43s
Postgres (14.4, discovery/postgres)	1m 2s
Postgres (14.4, writer/postgres)	1m 12s
SQLite (live/sqlite)	24s
SQLite (discovery/sqlite)	18s
SQLite (writer/sqlite)	28s
	25m 43s

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