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Turns relative imports into absolute imports, and removes imports in __init__…

Description

Turns relative imports into absolute imports, and removes imports in init (for generated project skeleton).

Summary:
When generating a new project with dagster new-repo, the boilerplate code will use absolute imports (rooted at the Python package) instead of relative imports.

Also, the generated __init__.py files will no longer contain re-imports. This should make it easier to rename things in the boilerplate.

Test Plan: local testing and buildkite

Reviewers: catherinewu, rexledesma, sidkmenon

Reviewed By: sidkmenon

Differential Revision: https://dagster.phacility.com/D6799