Changes: Authentication with temporal access token should be optional and removed in the future

[atimin]

Current problem

Currently, a client has to request a temporal access token with the API token. This token expires and the client's request fails with 401 error. Sometimes, it causes losing data because the sent data is already read from a stream or buffer.

Possible solution

A temporal access token has more disadvantages than advantages. We can make it optional and remove it in version 1.0.

Additional context

All SDKs should stop using the temporal access token as soon as possible.

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