Restructure repo & add CI workflows

[sisyphusSmiling]

Description

NOTE: CI will fail this run as there is no content to test

• Structures repo to accommodate both Cadence & Solidity files & tooling
• Adds CI workflows
• Update original templated repo files
• Replace Cadence dependency management

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For contributor use:

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