This is a continuation of #670, which supports binding Struct to dict, so users don't need to explicitly define a dataclass, and can even omit type annotations for Engine->Python value binding (e.g. argument of custom functions)

We also want to support it for Table types, in particular:

• For LTable, supports binding to list[dict[String, Any]]
• For KTable, supports binding to dict[K, dict[String, Any]] (K is key type; use a tuple if multiple key parts)
  (it's the runtime type we support, users don't have to annotate)

With this, we'll support omit type annotations for Engine->Python value binding for all data types.

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