add servable editing to sdk

[isaac-darling]

Not ready to be merged yet, remains untested. The DLHub Service has a corresponding update that adds the route this method requires. Considerations for deleting servables are also included, but the delete_servable function is not yet implemented.

[ascourtas]

Auth issues are fixed, but fails on incompatible typing syntax in Python 3.7 and 3.8, and in 3.9 and 3.10 we get the following error:

dlhub_sdk/utils/search.py:22: in search
    return super().exclude_field("dlhub.deleted", True).search(q, advanced, limit, info, reset_query)
E   RecursionError: maximum recursion depth exceeded while calling a Python object

Requires additional refactoring before merge is possible

[isaac-darling]

I thought this might happen, so I prepared a possible solution. Hopefully it helps :)

[coveralls]

Pull Request Test Coverage Report for Build 3064702654

• 12 of 36 (33.33%) changed or added relevant lines in 3 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.9%) to 87.972%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
dlhub_sdk/tests/test_dlhub_client.py	3	6	50.0%
dlhub_sdk/client.py	8	29	27.59%

Totals
Change from base Build 2929398202:	-0.9%
Covered Lines:	1653
Relevant Lines:	1879

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💛 - Coveralls

[ascourtas]

putting a pin in this until we have clarity on whether or not we're moving to a serverless architecture

[ascourtas]

addresses issues #134 and #135