Separate out TypeScript module library from the SDK

[cloutiertyler]

Description of Changes

Please note, much of the code changed in this PR is generated code.

This change updates the TypeScript SDK to use a new spacetimedb TypeScript library which lives under the /crates/bindings-typescript folder alongside /crates/bindings-csharp. Just like with the C# bindings library, the types for AlgebraicType and RawModuleDef are now code generated with a script in /crates/codegen/examples.

Pulling this out into a library allows us to use the same types and serialization code on both the server and the client for TypeScript modules.

In the process of making this change I also found and fixed several issues with the TypeScript code generation. Namely an issue with recursive types and an issue with the never type.

I have also improved the npm/pnpm scripts to be able to generate TypeScript code for us automatically by running pnpm generate for any place that we have to generate typescript code. Namely:

• Quickstart module bindings
• AlgebraicType/ModuleDef for TypeScript module library
• Client API messages for the TypeScript API
• TestApp module bindings

API and ABI breaking changes

IMPORTANT! This is an API breaking change for clients, as such it should be a major version change. However, I am going to see if I can shim in the old API as best as possible to make it compatible.

Notably, we were previously exporting APIs that end users do not need, and I don't think it would ever occur to them to use, namely the whole AlgebraicValue API and also the AlgebraicType API. In principle, no one should have a need for these, although it was technically possible for them to use it.

Indeed, we could potentially even just remove AlgebraicType completely from the API by directly code generating the serialization code.

Listed below are all of the BREAKING changes to the API and their effect:

• AlgebraicType is now a structural union literal type instead of a class (nominal type), this is a consequence of generating the type with our code gen. Users did not have a reason to use AlgebraicType directly.
• The AlgebraicValue type has been removed entirely. This was previously a class that was exported from the SDK, but very unlikely to be used by users.
• The ProductValue type has been removed.
• The ReducerArgsAdapter and ValueAdapter types, which were used with AlgebraicValues have been removed.
• Generated code has changed incompatibly so users will have to regenerate code when upgrading to this version. Technically a breaking change, but pretty easy to fix.

Listed below are the non-breaking API changes:

• I am now exporting generated product types as the default export in addition to how I was exporting them before
• For generated sum type T, I am now exporting a TVariants namespace which has the types of all the variants for T. This was previously exposed on the namespace T, but was inaccessible in modules other than the one it was defined in because I also export a type T in addition to namespace T and in the type position T was being interpreted as a type rather than a namespace. It's unclear why TypeScript resolved it as the T namespace within the module in which is was defined previously. Anyway, since the old types were apparently unobservable to users, I've replaced them with the types in TVariants. (Open to other names for this namespace).
• I fixed a bug where never types (sum types with no variants) were not correctly generated.

Expected complexity level and risk

3. The most complex thing about the PR are the potential impacts to the API. I am reasonably certain, but not 100% certain that I have accounted for everything above.

Testing

• I ran pnpm test which runs all the tests in the repo including an integration test which tests the connection to SpacetimeDB. I also fixed broken tests.

[gefjon]

I have no objections to the described breaking changes. I think that ideally we should save them for a minor version bump and include them in the release notes, under a heading like "Minor incompatible changes" or something. But I don't see any reason to hold them for a major version bump other than fanatical devotion to the SemVer spec.

I don't otherwise feel equipped to review this PR, and would prefer to leave it to others.

[bfops]

the .prettierignore file should not be moved without changes. The previous file was relative to the directory it was in. We should probably at least change /.github to .github in there.