[metastore] Convert partition browsing to the new editor

Currently looking at partitions values or browsing data on partitioned tables still use the old editor.

e.g. http://127.0.0.1:8000/metastore/table/default/web_logs

Step1
Create or reuse API similar to Browse or execute custom query like export query.

Step2 migrate calls to old editor
Convert Browse partition links to behave like Browse data
https://github.com/cloudera/hue/blob/master/desktop/libs/notebook/src/notebook/views.py#L116

Step 3
Add/tweak a Browse only mode to the editor, cf. screenshot