Redo message decode as a single pass

Decode has previously been two passes: first chunk the message into a
reversed list of toplevel diameter_avp records, then fold through the
reversed list to build the full result. Various workarounds have made it
a bit more convoluted than it should be however. Rework it completely,
turning the previous 2-pass tail-recursive implementation into a 1-pass
body recursive one.

The relay decode still exists in diameter_codec, as a stripped down
version of the full decode in diameter_gen.

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