SG-10151: set field visibility via API

[jfboismenu]

Adds support for updating field visibility through the API.

This can be achieved by the following code:

sg.schema_field_update("Asset", "sg_my_custom_field", {"visible": False}, project)

where project is a dictionary referring to project in which we want to hide "sg_my_custom_field". Restoring visibility can be done via

sg.schema_field_update("Asset", "sg_my_custom_field", {"visible": True}, project)

Note: The build is currently failing because the feature hasn't been released in Shotgun. Once the feature is released the test will be updated to the right version check and the feature commited.

[coveralls]

Pull Request Test Coverage Report for Build 1248

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 159 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.9%) to 68.723%

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Files with Coverage Reduction	New Missed Lines	%
shotgun_api3/shotgun.py	159	82.78%
<!--	Total:	159		-->

Totals
Change from base Build 1207:	-0.9%
Covered Lines:	6752
Relevant Lines:	9825

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💛 - Coveralls