Give Drydock leases a resourcePHID instead of a resourceID

Summary:
Ref T9252. Leases currently have a `resourceID`, but this is a bit nonstandard and generally less flexible than giving them a `resourcePHID`.

In particular, a `resourcePHID` is easier to use when rendering interfaces, since you can get handles out of a PHID.

Add a PHID column, copy over all the PHIDs that correspond to existing IDs, then drop the ID column.

Test Plan:
  - Browsed web UIs.
  - Inspected database during/after migration.
  - Grepped for `resourceID`.
  - Allocated a new lease with `bin/drydock lease`.

Reviewers: chad, hach-que

Reviewed By: hach-que

Maniphest Tasks: T9252

Differential Revision: https://secure.phabricator.com/D14151

src/applications/drydock/controller/DrydockResourceViewController.php

@@ -27,7 +27,7 @@ final class DrydockResourceViewController extends DrydockResourceController {
 
     $leases = id(new DrydockLeaseQuery())
       ->setViewer($viewer)
-      ->withResourceIDs(array($resource->getID()))
+      ->withResourcePHIDs(array($resource->getPHID()))
       ->execute();
 
     $lease_list = id(new DrydockLeaseListView())