refactor: migrate current `bentoml.testing` to use `bentoml.client`

[aarnphm]

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Feature request

With https://github.com/bentoml/BentoML/pull/3028 it introduces bentoml.client.

Currently what we are doing under bentoml.testing are essentially doing what bentoml.client is doing.

This refactor would make bentoml.testing more clean and dry ;)

Motivation

No response

Other

No response

[DhanshreeA]

Hey is this good to take up? :grimacing:

[aarnphm]

Yes feel free to get started with this. Feel free to DM me on slack for more information.

[spyrosavl]

Hi, @DhanshreeA are you working on it? If not I can pick this up?

[sanspareilsmyn]

@aarnphm @DhanshreeA Hi there! If you are stucked with this issue, may I try instead? Have a great day:)