Add streaming callbacks

[rygine]

Summary

• Simplified AsyncStream types, removed value transformer
• Added isDone getter to AsyncStream
• Added optional callback parameter to all streaming functions for more flexibility in handling streams
• Added stream data transforms before calling stream callback
• Added conversations map and get function to Conversations to allow for quick access to conversations that are created, listed, or streamed during a client session
• Replaced usage of @xmtp/xmtp-js in favor of @xmtp/content-type-primitives

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 961a0139c10ad5e9f9e417166457adaae0ccde9f

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

| Name | Type | | ---------------- | ----- | | @xmtp/mls-client | Patch |

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