[Test Framework] Run setup/teardown before/after tests

[SupunS]

Work towards https://github.com/onflow/cadence/issues/331

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• [ ] Targeted PR against master branch
• [x] Linked to Github issue with discussion and accepted design OR link to spec that describes this work
• [x] Code follows the standards mentioned here
• [x] Updated relevant documentation
• [x] Re-reviewed Files changed in the Github PR explorer
• [x] Added appropriate labels