contract ABI: jump to method implementation

[tom2drum]

It is nice to have a link next to contract method (read or write) to its actual implementation in contract source code

In theory we can achieve it by doing something like this

1. Get the selector
2. Find this selector in the selector switch in the raw proxy or implementation bytecode (http://blog.openzeppelin.com/deconstructing-a-solidity-contract-part-iii-the-function-selector-6a9b6886ea49)
3. Get the source maps of the contract in whose bytecode we found the selector
4. Using the JUMP instruction from the selector switch and source map, find the desired line in the desired file
5. Check function name just in case

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🔗 rust team issue - https://github.com/blockscout/blockscout-rs/issues/571