Introduce ark-vrf (#7669)

Superseeds `bandersnatch_vrfs` with
[ark-vrf](https://crates.io/crates/ark-vrf)

- Same crypto as JAM
- With a spec: github.com/davxy/bandersnatch-vrf-spec
- Published on crates.io

#7670 follow up

NOTE: this crypto is under experimental feat

---------

Signed-off-by: Oliver Tale-Yazdi <[email protected]>
Co-authored-by: Sebastian Kunert <[email protected]>
Co-authored-by: cmd[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: Oliver Tale-Yazdi <[email protected]>

Author: 4 people

.config/zepter.yaml

@@ -12,7 +12,7 @@ workflows:
         # Check that `A` activates the features of `B`.
         'propagate-feature',
         # These are the features to check:
-        '--features=try-runtime,runtime-benchmarks,std',
+        '--features=try-runtime,runtime-benchmarks,std,bandersnatch-experimental',
         # Do not try to add a new section into `[features]` of `A` only because `B` expose that feature. There are edge-cases where this is still needed, but we can add them manually.
         '--left-side-feature-missing=ignore',
         # Ignore the case that `A` it outside of the workspace. Otherwise it will report errors in external dependencies that we have no influence on.