Add possibility to create users in LDAP mode

[dx034]

Closes #18545 , code changes are identical to the ones made for remote user mode in #19963.

[boring-cyborg]

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[boring-cyborg]

Awesome work, congrats on your first merged pull request!

[dx034]

@potiuk Thanks for merging the changes. Do you think this could still be considered for 2.2.6, given that it's a minor fix?

[ashb]

I'm afraid not @dx034 -- 2.2.x is only bug fixes, and this is firmly in New Feature territory. The good news is that 2.3.0 "days" away from starting beta/RC so should be out soon.

(And we won't be releasing a 2.2.6 anyway)

[potiuk]

Yep. 2.3.0 it is. With all the batteries included :)