Create a v2 equivalent for 'COLSTATUS'

Solr's 'COLSTATUS' command under the v1 /solr/admin/collections endpoint has no full v2 equivalent. The /v2/collections/<collName> API has similar (identical?) output as a vanilla COLSTATUS request, but COLSTATUS can also return detailed index information that /v2/collections/<collName> cannot expose. We should add parameters to this v2 API to expose similar data to achieve parity with the v1 COLSTATUS API.