TypeScript HTTP handlers - Module Bindings

[JasonAtClockwork]

Description of Changes

Cleaning up the TypeScript HTTP handler module bindings on top of the V8 host/module work from #4931.

• Consolidate the inbound handler API around http_handlers.ts
• keeps outbound procedure HTTP in http_internal.ts
• moves shared HTTP code into http_shared.ts to avoid dependency issues
• moves the inbound wire/runtime bridge into runtime.ts

API and ABI breaking changes

Cleaning up the API layer:

• spacetimedb.httpHandler(...)
• spacetimedb.httpRouter(...)
• Router
• handler-side Request

Expected complexity level and risk

2 - I needed to move code out of http_internal.ts to have it shareable for http_handler.ts adding more churn than I'd like.

Testing

• Expanded the smoketests
• Expanded unit test coverage
• Local throwaway test suite