Show create folder button on specific picking action

By UX design doc, we should show create folder button on toolbar rather
than in three dot menu for better UX and user convenience.
Set sort button on toolbar too while OPEN_DOCUMENT_TREE too becuase it
will be the only item in three dot after we move create folder outside.

Bug: 141599678
Test: manual
Test: atest DocumentsUIGoogleTests
Change-Id: I9dae292d66da2b2c5dc9235a5c76fb75959855e3