Add batch operations support to `JdbcClient`

[sdeleuze]

Similar to #33812 but for JdbcClient.

[matt-locker]

@sdeleuze
For replacing JdbcTemplate, this is the last remaining bit :)
Any chance this will land also on 6.x?

[sdeleuze]

Likely not, too involved, but let's confirm when implemented in 7.0.