feat: added compile flag to bentoml.keras.load_model()

[MarioMarkov]

What does this PR address?

When you load a model from a directory a warning is shown that the model is not compiled, to remove the warning you have to pass compile=False to keras load_model() function. The implementation of bentoml.keras.load_model() was missing this argument.

Fixes (#3948)

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[frostming]

What about passing **kwargs to load_model() function? /cc @aarnphm

[aarnphm]

Ah we need to also support saving it and somehow handle kwargs during get_runnable