CLI changes for Sunrise initiative

[saihaj]

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1. Make subgraph-studio the default deployment target #1513
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2. Remove --from-hosted-service from graph deploy #1512
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3. Remove --product from graph init #1514
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4. Remove --studio from graph init #1515
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5. Remove --access-token from graph deploy #1516
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6. Remove graph remove command from top level instead Introduce a subcommand part of graph local module #1517
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7. Simplify subgraph name validation logic #1518
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8. graph auth to only work for Studio. Remove all other flags #1519
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9. Remove graph create command from top level instead Introduce a subcommand part of graph local module #1520
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10. Remove validateStudioNetwork during deploy #1509
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11. part of init make git disabled by defualt #1532
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