Infer sync statements for raw tables

[simolus3]

This builds on top of the new raw table options introduced in #163.

This makes the put and delete statements set on raw tables optional. If they're omitted, the sync_local step of each sync will attempt to infer them by looking at the actual columns of the table:

1. The id column will be set to the affected row id.
2. Other columns will be bound to extracted JSON values of the same name.
   • Columns marked as local-only are ignored.

Inferred statements are cached until pragma schema_version returns a new value.

For now, this does not support a dedicated _rest column that would be inferred by default. Users interested in that would have to use explicit statements instead.

[rkistner]

Is it feasible to add a test for the generated SQL? Even if it's just a Rust unit test rather than an "end-to-end" Dart one.

[simolus3]

Is it feasible to add a test for the generated SQL? Even if it's just a Rust unit test rather than an "end-to-end" Dart one.

We can pretty much only test this in Rust because the statements are internal to the extension and not exposed. I've added tests at the end of raw_tables.rs now.

The base branch was changed.