* Adds the capability to retrieve a property field by name
Allows to retrieve a property field by name and groupID. As the name
is only unique within the context of a group, and we can have multiple
fields with the same name in the store, for this method the groupID is
directly included in the query instead of being an optional field.
* Adds the targetID parameter to correctly filter fields
* Ensure the method only retrieves non-deleted fields
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Co-authored-by: Miguel de la Cruz <miguel@ctrlz.es>
Co-authored-by: Mattermost Build <build@mattermost.com>
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