SQLx

feat: expose APIs to bind custom memory allocators #5043

Job	Run time
Format	14s
Check build using minimal versions	1m 41s
Check (tokio, rustls)	1m 20s
Check (async-std, none)	1m 25s
Check (async-std, rustls)	1m 32s
Check (async-std, native-tls)	1m 23s
Check (tokio, none)	1m 23s
Check (tokio, native-tls)	1m 30s
Unit Tests	2m 41s
MySQL	0s
SQLite	0s
Postgres	-1s
MariaDB	-1s
	13m 7s

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