feature: add Predictor.update_endpoint()

[laurenyu]

Issue #, if available:
#1470

Description of changes:
tangentially related to #1470 is to move the endpoint-related methods away from estimators. Deprecating the update_endpoint arg in deploy() will come in a separate PR.

I chose not to take values from an existing ProductionVariant because I thought it would complicate the logic too much. Open to being convinced otherwise.

Testing done:
unit tests, linters, the affected integ tests

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[chuyang-deng]

I’m just curious about the None check here. Why are we checking the args and raise ValueError instead of making them required variables?

[laurenyu]

my thinking was that if someone wanted to update only the tags, KMS key, or data capture config, they shouldn't need to provide all the other info too.