Add "persistence" types (data, cache, or index) to tables, and tweak what "storage dump" dumps

Summary:
Ref T13000. This marks each table as either "data" (normal data), "cache" (automatically rebuilt, no need to ever dump) or "index" (can be manually rebuilt).

By default, bin/storage dump dumps data and index tables, but not cache tables.

With --no-indexes, it dumps only data tables. Indexes can be rebuilt after a restore with bin/search index --all ....

Test Plan:

• Ran --no-indexes and normal dumps with --trace, verified that cache and index (former case) or cache only (latter case) tables were dumped with --no-data.
• Verified dump has the same number of CREATE TABLE statements as before the changes.
• Reviewed persistence tags in the web UI (note Ferret engine tables are "Index"):

Reviewers: amckinley

Reviewed By: amckinley

Maniphest Tasks: T13000

Differential Revision: https://secure.phabricator.com/D18682