Major Release 3.0.0

[flostadler]

This issue tracks the work required for pulumi-awsx 3.0.0, including breaking changes, major features, and required testing.

Breaking Changes

• [ ] https://github.com/pulumi/pulumi-awsx/issues/1292
• [ ] https://github.com/pulumi/pulumi-awsx/issues/947

New Features

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Testing

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