massive testing & repo overhaul

[PatrickAlphaC]

• Minimized & cleaned tests
• Created event listeners instead of relying on sleep for running tests
• Added gas reporter
• Cleaned up readme
• Condensed task imports
• Added auto-verification
• Removed 99_Setup_Contracts in favor of adding auto fund directly with AUTO_FUND environment variable
• Renamed integration to staging
• Added events to APIConsumer and RandomNumberConsumer
• Added solhint script
• Removed eslint in favor of just a prettier formatter
• Added a sample script over tasks