Add String() method to GasMeter

[fedekunze]

Summary

Add String() function to GasMeter Interface

Problem Definition

fmt.Println(ctx.GasMeter()) returns a string that is hard to grasp since it doesn't reference the fields (eg: &{22000 21272})

The expected value should look something like:

GasMeter:
    GasLimit: 22000
    GasConsumed: 21272

Proposal

Add String() function to GasMeter interface and to the concrete types that implement it

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[Sladuca]

Hi, I'd like to take this on provided nobody else has.

[alexanderbez]

Yes please @Sladuca :)