Contract metadata

[bowenwang1996]

Basic implementation of contract metadata described here.

[DanielRX]

Main thing I noticed that would keep the format, but reduce code size
The current JSON is

viewMethods: {
    [methodName: string]: {
        name: string (methodName),
        parameters: {[key: string]: string},
        returnType: string
    }
}

by removing name: methodName, or converting viewMethods into an array, you reduce the size of the JSON by the total string length of all method names, and the name being duplicated doesn't serve any benefit to the developer

[vgrichina]

I agree that we don't really need name: string (methodName), part

[bowenwang1996]

Yeah I'll change that