[Feature Request] Support `bulkWrite` command

[AlekSi]

Purpose of the feature.

https://www.mongodb.com/docs/manual/reference/command/bulkWrite/
This command is not supported in DocumentDB.

Describe the solution you'd like

I would like this command to be supported in DocumentDB.

Describe alternatives you've considered

Emulate it in FerretDB using existing commands.

Additional context

N/A

[lichoil]

@AlekSi
we are working on 8.0 operators, and bulkwrite is one of them.
(e.g. this week's sync will bing some 8.0 operator - $toUUID).

[safern]

@lichoil might be good to assign it to who is working on this.

[shuaitian-git]

@duanpei-ms