DRAFT: Make POST/PUT payload visible in requests.json

[vasuraman11]

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The libmtev HTTP observer module and libmtev have been changed to expose the incoming HTTP payload if it is text, so that we can see the incoming payload using requests.json.

[postwait]

Am I reading this right that we're going to pay a large allocation and memcpy on every request now? This seems like a bad default performance sacrifice.

Perhaps http end points should opt into this.