Add Orchard support to zcash_client_sqlite

[str4d]

We need the ability to track Orchard notes in the wallet, and spend them.

I think the simplest integration pathway is to add a note_type column to most tables, with a default of "Sapling" (to match current internals), and then we can use an "Orchard" type to separate notes. However, some tables might be quite Sapling-specific (I'm thinking in particular about rcm, which won't be a sufficient column for Orchard), where we need a new Orchard-specific table.

[nuttycom]

Closed by #1182, #1234, #1241, #1235, #1248, #1254, #1255, #1262