Rust module API rework

[coolreader18]

WIP - waiting on abi rework implementation.

[gefjon]

• You still have the macros looking for known concrete types for columns marked autoinc.
• I would really appreciate some comments and docs on the macros. In particular, listing some examples of expected inputs and outputs, and some explanation of why the different parts of the outputs are there and what parts of the runtime system they plug into.

[gefjon]

We need to discuss (on the proposal) whether we actually want to accept all combinations of T and &T.

[coolreader18]

Currently just blocked on #1704.

[coolreader18]

I guess now it's just blocked on an implementation in ModuleHost

[coolreader18]

The merge is just for testing - I'll rebase once #1697 actually merges.

[coolreader18]

@Centril do you know why this might be failing? In BTreeIndex::filter():

        let index_id = Idx::index_id();
        let args = b.get_args();
        let (prefix, prefix_elems, rstart, rend) = args.args_for_syscall();
        let iter = sys::datastore_btree_scan_bsatn(index_id, prefix, prefix_elems, rstart, rend)
            .unwrap_or_else(|e| panic!("unexpected error from datastore_btree_scan_bsatn: {e}"));
        TableIter::new(iter)

It panics not at the lookup of the index id by name (searches the system tables), but in datastore_btree_scan_bsatn with "No such index" (searches index_id_map). Is the index not getting properly committed to the database state? As far as I can tell it is, but I don't know why else this would be failing.

[coolreader18]

gruhhh.... the tests are failing because the rust module now declares snake_case table names but the csharp module doesn't

[coolreader18]

theoretically this is all tests passing, besides that

[coolreader18]

maybe

[coolreader18]

yeah, rust tests are all passing for me locally

[coolreader18]

Reviewer's discretion whether this is an acceptable solution, I guess.

[gefjon]

Can you alter the C# module to define snake_case table names by changing class MyTable to class my_table?

[gefjon]

Don't merge until we have a companion PR for private.