FEATURE: add multiselect user custom field (PR #13560)

Export that object so it can be easily openend by plugins/components and extended.

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@lis2 Is this intended for use in core? Otherwise, we should use the plugin API if we intend to allow plugins to extend this.

We have to bump the version here too.

@lis2 Looks good to me but do squash the commits with a proper commit title before merging :slight_smile:

The title of this pull request changed from “FIX: export UserFieldType” to "FIX: add addUserField to plugin-api

@lis2 This is probably a FEATURE instead of a FIX

The title of this pull request changed from “FIX: add addUserField to plugin-api” to "FEATURE: add addUserField to plugin-api

The title of this pull request changed from “FEATURE: add addUserField to plugin-api” to "FEATURE: add multiselect user custom field