Added group name case conversion

[gertjanal]

Description

Added the property group-provider.group-case to etc/group-provider.properties with the following configuration options:

• keep
• lower
• upper

Additional context and related issues

This change allows conversion of group names to uppercase and lowercase, to allow integration with Apache Ranger where silimar conversion is used; ranger.usersync.ldap.groupname.caseconversion = upper.

In a previous iteration I added this property to the LdapGroupProviderConfig, but I think it is better to allow the property to be set on all GroupProvider implementations.

Fixes #25396

Release notes

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## Group providers
* Added support for group name case conversion in the group provider properties. ({issue}`25396`)

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[gertjanal]

@MiguelWeezardo @mosiac1 Can you please review my changes?

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