Fix and refactor Starknet Wrapper

[FabijanC]

Usage related changes

• Fix ClientConnectorError appearing on mac with venv set in hardhat.config.ts
• Close URL adaptation should only be done in DockerWrapper #275

Development related changes

• Expand venv testing to include network tests
  • Had we had such tests, we would have spotted this URL adaptation issue
  • This used to be done but I unknowingly removed it in Adapt to cairo-lang 0.10.3 #256
• Close Refactor StarknetWrapper classes #276

Checklist:

• Formatted the code
• No linter errors + tried to avoid introducing linter warnings
• Performed a self-review of the code
• Rebased to the last commit of the target branch (or merged it into my branch)
• Documented the changes
• Updated the test directory (with a test case consisting of network.json, hardhat.config.ts, check.ts)
• Linked issues which this PR resolves
• All tests are passing (for external contributors who don't have access to the CI/CD pipeline)

[Nathan-SL]

LGTM! Let's rebase.