Pluggable api client

[neekolas]

Summary

• Creates an interface type for ApiClient to allow for alternative implementations
• Allows the user to override the default ApiClient creation process with their own implementation
• Adds a bunch of exports to the package to facilitate building your own ApiClient implementation
• Moves all base64 decoding into the ApiClient instead of handling in the application
• Changes return type of subscribe method, to support future changes which will allow updating content topics without closing the stream

Solves

#438

Notes

Bit of backstory on the base64 decoding. The code generator for GRPC gateway is inconsistent with the envelope type. When sending a message, you can provide the message field as a Uint8Array. But when receiving messages, it returns that field as a base64 encoded string. In order to provide a consistent API that matches the new type definition, we need to consolidate that logic in the HttpApiClient. This also just feels tidier.

This is a breaking change and will go into the next major SDK release

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[mkobetic]

Looks like nice clean up.

[github-actions]

🎉 This PR is included in version 11.0.0-beta.1 🎉

The release is available on:

• npm package (@beta dist-tag)
• GitHub release

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