MDEV-30203 Move mysql symlinks to different package

For both Deb and RPM, create mariadb-client-compat and
mariadb-server-compat containing the mysql links to the mariadb
named executables/scripts.

The mariadb-client-core mysqlcheck was moved to mariadb-client-compat.

The symlinks in MYSQL_ADD_EXECUTABLE is tagged as a
{Client,Server}Symlinks component and placed in
the symlinks packages.

Man pages are restructured be installed into compat package
if that matches the executable.

Columnstore has a workaround as it doesn't use the cmake/plugin.cmake.

Scripts likewise have compatibility symlinks are in
the {server,client}-compat packages.

Co-author: Andrew Hutchings <andrew@linuxjedi.co.uk>

Closes #2390

debian/mariadb-server-core.install

@@ -1,19 +1,13 @@
 usr/bin/innochecksum
 usr/bin/mariadb-install-db
 usr/bin/mariadb-upgrade
-usr/bin/mysql_install_db
-usr/bin/mysql_upgrade
 usr/bin/resolveip
 usr/sbin/mariadbd
-usr/sbin/mysqld
 usr/share/man/man1/innochecksum.1
 usr/share/man/man1/mariadb-install-db.1
 usr/share/man/man1/mariadb-upgrade.1
-usr/share/man/man1/mysql_install_db.1
-usr/share/man/man1/mysql_upgrade.1
 usr/share/man/man1/resolveip.1
 usr/share/man/man8/mariadbd.8
-usr/share/man/man8/mysqld.8
 usr/share/mysql/bulgarian
 usr/share/mysql/charsets
 usr/share/mysql/chinese