RemoteRunnable: Parse the whole message and not just the content

[amarion35]

Checked

• I searched existing ideas and did not find a similar one
• I added a very descriptive title
• I've clearly described the feature request and motivation for it

Feature request

The parsing of the message is handled by the revive function in langchain-core/src/runnables/remote.ts but most message attributes are never parsed by the function like name, additional_kwargs, response_metadata and id.

Motivation

1. All these attributes are send to the RemoteRunnable so I see no reason to not parse them.
2. Some of these attributes are actually really useful. For example the response_metadata can contains a finish_reason attribute which tell if a chunk is the last of a message.

Proposal (If applicable)

For example the parsing of the AIMessageChunk is done like this:

      if (obj.type === "AIMessageChunk") {
        return new AIMessageChunk({
          content: obj.content,
        });

but I would expect it to be done like this:

      if (obj.type === "AIMessageChunk") {
        return new AIMessageChunk({
          content: obj.content,
          name: obj.name,
          additional_kwargs: obj.additional_kwargs,
          response_metadata: obj.response_metadata,
          id: obj.id,
          tool_calls: obj.tool_calls,
          invalid_tool_calls: obj.invalid_tool_calls,
          usage_metadata: obj.usage_metadata,
          tool_call_chunks: obj.tool_call_chunks,          
        });