Expand support for update metadata and tracking old values

[simolus3]

This is a follow-up for #60 to:

• Support tracking old values with include_old for DELETE statements.
• Support storing old values only if they have changed (through include_old_only_when_changed).
• Support storing old values only for a subset of column names (by setting include_old to a JSON array string).
• Support include_metadata for inserts.
• Support include_metadata for deletes with a special UPDATE <table> SET _deleted = TRUE syntax (we can't attach data to the delete otherwise).

It also refactors some of the implementation details, in particular:

1. This updates the sqlite-rs version, and then applies our fork that makes ResultCode implement Clone and Copy.
2. Refactors extracting table options into a typed TableInfo struct.
3. Moves the logic for creating and iterating over the columns array of a schema table into a shared struct utilizing the streaming_iterator create. This makes it easier to pass custom iterators to json_object_fragment, which is used to restrict include_old to a list of columns.
4. Simplifies the format! logic to create triggers by using inline references, making it easier to understand. (Eventually, I want to spend some time eventually to that further by e.g. using write!, we're using lots of small allocations and duplicate logic here.)

The base branch was changed.