Add permission support for workbook

[sluenenglish]

I have taken the work that @DepthDeluxe did in #292 and tried to implement most of the suggestions left in the code review, as well as adding some more tests.

I've restricted the scope to workbooks as suggested in #292 for ease of review. I will add the support for projects and datasources once I've gotten some feedback.

Here is a sample usage:

server.workbooks.populate_permissions(wb)
print(wb.permissions)

permisssion_collection = TSC.PermissionsCollection(
    [
        TSC.PermissionsRule(
            TSC.PermissionsGrantee(TSC.Permission.GranteeType.Group, "<group-id>"),
            {
                TSC.Permission.WorkbookCapabilityType.AddComment: TSC.Permission.CapabilityMode.Deny
            },
        ),
        TSC.PermissionsRule(
            TSC.PermissionsGrantee(TSC.Permission.GranteeType.User, "<user-id>"),
            {
                TSC.Permission.WorkbookCapabilityType.AddComment: TSC.Permission.CapabilityMode.Deny
            },
        ),
    ]
)

server.workbooks.delete_permission(wb, permisssion_collection)

server.workbooks.update_permission(wb, permisssion_collection)

[t8y8]

Thank you for the PR!

I have another MR in progress that changes the design a bit, and covers support for workbooks (#429) that would supersede this.

I'd appreciate your review or thoughts/concerns on the design changes; but 429 covers all the new types coming soon to Server, and plays with some of the existing patterns well.

[sluenenglish]

Thanks for your response @t8y8

Sorry, I didn't see that PR. Not a problem, I will close this one.