Add type annotations compatible with mypy/pyright

[koteyur]

Hi, could you please add type annotations in the format which would mypy and/or pyright recognize?

I've tried both mypy/pyright and their stubgens, unfortunately, none of them is able to parse type annotations in format of (core/models/instance.py):

:param defined_tags:
    The value to assign to the defined_tags property of this Instance.
:type defined_tags: dict(str, dict(str, object))

It looks like, most of OCI SDK code is generated. If so, it should be possible to adopt generation process in order to support proper type annotations.

[bhagwatvyas]

@koteyur thank you, we're investigating into supporting typing in the OCI SDK.