[feat]: Enhanced Search - Right click on UDT and find usages

[millerjp]

When right clicking on a UDT display an option to "Find Usages" where we search and list all the tables, views and indexes on UDT fields.

We may need to think about how we display the search results - I think we should have a new search results window pop up somewhere, listing the hits and clickin on the hits takes you to the entity in the tree.

I can see other search type requirements that can use this way of rendering results eg search ACLs etc..