Don't allow creation of database with ICU locale with unsupported encoding

Peter Eisentraut <peter@eisentraut.org>

Commit: c7db01e325a530ec38ec7ba57cd3ed32e123e33c
Author: Peter Eisentraut <peter@eisentraut.org>
Date: 2022-09-16T07:41:33Z
Releases: 16.0
Don't allow creation of database with ICU locale with unsupported encoding

Check in CREATE DATABASE and initdb that the selected encoding is
supported by ICU.  Before, they would pass but users would later get
an error from the server when they tried to use the database.

Also document that initdb sets the encoding to UTF8 by default if the
ICU locale provider is chosen.

Author: Marina Polyakova <m.polyakova@postgrespro.ru>
Reviewed-by: Kyotaro Horiguchi <horikyota.ntt@gmail.com>
Discussion: https://www.postgresql.org/message-id/6dd6db0984d86a51b7255ba79f111971@postgrespro.ru

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