remove server batch

[wanliAlex]

• Please check if the PR fulfills these requirements

• [x] The commit message follows our guidelines

• [x] Tests for the changes have been added (for bug fixes/features)

• [x] Docs have been added / updated (for bug fixes / features)

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...) remove theserver_batch_size in add_documents API

• What is the current behavior? (You can also link to an open issue here) we have an argument server_batch_size

• What is the new behavior (if this is a feature change)? The argument server_batch_size is removed

• Does this PR introduce a breaking change? (What changes might users need to make in their application due to this PR?) Yes

• Other information: The related marqo pr is https://github.com/marqo-ai/marqo/pull/527

pytest is passed

[wanliAlex]