Preview SDK for Microsoft.ResourceGraph

[ilidemi]

Microsoft.ResourceGraph is a new resource provider that allows customers to explore their Azure resources at scale using a powerful query language (KQL). We are launching in Public Preview at Ignite and aiming to release CLI/PowerShell tools by then.

More info here: https://aka.ms/resource-graph/intro

Swagger spec PRs: #3716 and #3796
Autorest config PR: #3795

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• Please add REST spec PR link to the SDK PR
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[dsgouda]

Looks great apart from a minor comment. Thanks for addressing all the warnings

[dsgouda]

Missed a comment

[dsgouda]

@demyanenko squash commits into a single commit and we are good to merge

[dsgouda]

LGTM

[ilidemi]

@dsgouda Squashed and pushed.