feat: drawing manager support #93
                
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Based on previous #73 and #75, adds support for drawing manager, with the following details:
azure-maps-controlin target generated bundle.cannot read children of undefined in _updateModeissue mentioned in feat: add drawing manager tools #75 (comment) by instantiating toolbar control in map ready handler and letting users pass toolbar params rather then toolbarControl instancesSample usage:
NOTE: features added directly into AzureMapDrawingManagerProvider are editable.
Coverage after added unit tests:
Playground example is at Azure/react-azure-maps-playground#49