TMDM-7737 "View testing doesn't work on a my View"

Fix metadata field projection *with* paging in query.
MetadataField now extends TypedExpression (all implementations of MetadataField were already implementing TypedExpression).
Adds unit test to ensure behavior.
(https://jira.talendforge.org/browse/TMDM-7737)
Merge branch 'maintenance/5.6'