ROLL-9 Handle double brackets for code section in origination payload

[matsakiv]

• added processing of double brackets for "code" section;
• added test for run_operation.

Resolves #11

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Test Results

727 tests  +1   727 :heavy_check_mark: +1   8s :stopwatch: ±0s     9 suites ±0       0 :zzz: ±0      1 files   ±0       0 :x: ±0 

Results for commit 04480af5. ± Comparison against base commit 08209a3e.

:recycle: This comment has been updated with latest results.

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Deployed at sr1TaGTXCvtMq4ACnwLWMQak1nff9p7EA3SR