Fixes for default values in bicepconfig.json

[StephenWeatherford]

• [ ] Intellisense default for the entire config file can have just the rules section (like currently)
• [ ] Fix: Intellisense default for moduleAliases is missing "public", should be this: "ts": {}, "br": { "public": { "registry": "mcr.microsoft.com", "modulePath": "bicep" } },
• [ ] Make Intellisense default for the cloud section this (currently it's an empty object): "cloud": { "currentProfile": "AzureCloud", "credentialPrecedence": [ "AzureCLI", "AzurePowerShell" ], "profiles": {} }
• [ ] Add tests to make sure Intellisense defaults (bicepconfig.schema.json) match what is in default bicepconfig.json file (it would be even better to have one generate the other, maybe later)