Increase payload size, add default express error handler #152
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Closes #151
Rationale
I've set the maximum payload limit to 10mb which should be more then enough for practical use cases. The higher the limit is the bigger is the risk of Signed API being spammed by attackers. We have Airnode allowlist in the config, but even processing such huge payloads incurs some overhead.
I've also added an e2e test that validates this.