fixed registration of the contract during testing

[zhalninde]

Closes: #13

• added FlowTestContractDeployment::alias (default "0x{name.uppercase()}")
• checking prefix '0x' when registering an address
• set AddressRegistry::defaultChainId to EMULATOR when configuring

[github-actions[bot]]

Unit Test Results

  9 files  ±0    9 suites  ±0   23s :stopwatch: ±0s 34 tests ±0  28 :heavy_check_mark: ±0  0 :zzz: ±0  6 :x: ±0 

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Results for commit 454184d3. ± Comparison against base commit 454184d3.