Adding changes to use CosmosFacade as singleton

CosmosFacade currently contains static methods. Generally it is a good practice to have a singleton instead of static for easy testability.

Incremented version to v0.0.10

Work Item: https://dev.azure.com/msazure/One/_workitems/edit/7604163/?workitem=7613326

[ Will raise PR's to fix current consumers of CosmosFacade (entitlement and legal) ]