Adding an advanced example of events, eth_getLogs and JSON-RPC pitfalls

[miohtama]

What was wrong?

Documentation did not cover the pitfalls of how to fetch events over eth_getLogs.

How was it fixed?

Super comprehensive example code in examples.rst.

Cute Animal Picture

Art by Hayley Jane Wakenshaw

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[wolovim]

thanks a ton for this @miohtama! will give it a proper read tomorrow.