feat: add functions for parsing chat messages

[mattjohnsonpint]

This adds a ParseMessages function to the OpenAI model interface in the SDKs. These can be used for restoring chat messages in a conversation loop.

When restored, the original message type is not used. Rather, a RawMessage type is used instead. This preserves the JSON contents of the message for replay/round-tripping, without the overhead of rematerializing the specific message object structures.

Also updates all AssemblyScript projects to use json-as 1.0.8

[linear]

HYP-3397 Model message state reconstruction

[Copilot]

Pull Request Overview

This PR introduces functions for parsing chat messages to enable message round-tripping without re-materializing the original message types. Key changes include:

• Adding a ParseMessages function and corresponding raw message types for both Go and AssemblyScript.
• Implementing unit tests in Go and AssemblyScript to verify the round-trip JSON representation.
• Updating the AssemblyScript test harness and build configuration for the new functionality.

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
sdk/go/pkg/models/openai/chat_test.go	Adds test coverage for the ParseMessages function in Go.
sdk/go/pkg/models/openai/chat.go	Implements the raw message type and ParseMessages function.
sdk/assemblyscript/src/tests/openai.run.ts	Updates the instantiation setup for AssemblyScript tests.
sdk/assemblyscript/src/models/openai/chat.ts	Introduces the RawMessage class and parseMessages function.
sdk/assemblyscript/src/assembly/tests/openai.spec.ts	Adds a round-trip test for chat messages in AssemblyScript.

Comments suppressed due to low confidence (1)

sdk/go/pkg/models/openai/chat.go:1252

• The rawMessage implementation uses fmt.Errorf but there is no import for the 'fmt' package. Please add 'import "fmt"' to avoid compilation errors.

return nil, fmt.Errorf("missing data in message")

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[mattjohnsonpint]

@JairusSW - please take a look at the json issue. Thanks.

[mattjohnsonpint]

I have captured the JSON issue here: JairusSW/json-as#132