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In this design, the thin multiplexing layer between PoW types is always
available when onion services are in use, but the specific pow schemes
(and their dependency libraries) are gated by crate features everywhere.
There are now no new cfg() gates.
When the pow-v1 scheme is disabled, we can parse `pow-params v1` lines
into an empty type (so clients know a PoW scheme exists that might be
supported if they were configured differently). We currently don't save
the contents of unknown hsdesc items.
On the relaycell side, the hs ext module already sets a strong precedent
for keeping unrecognized data as a byte vec, and it doesn't provide a
good way to signal soft parse errors like unrecognized optional
extensions. There, the `v1` type is completely optional, and services
lacking a pow scheme suggested by a client would see one of these
'unrecognized' blobs. This isn't necessarily helpful but it fits the
rest of the design.
Co-authored-by: Micah Elizabeth Scott <[email protected]>
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