Update Prysm to V0.10.1

[nisdas]

This PR updates Prysm to v0.10.1 of the spec.

• Update the BLS API to conform with the specified draft from the ietf
• Add in Signing Root Container to use for signing objects.
• Add ComputeSigningRoot to take in the object and domain to return a valid root
  for a private key to sign.
• Fix references across the repo to remove usage of domain where required.
• Check for clock disparity in gossip messages.
• Fix spec tests
• Regenerate Benchmark Files

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@2719382). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master    #4804   +/-   ##
=========================================
  Coverage          ?   45.44%           
=========================================
  Files             ?      218           
  Lines             ?    17552           
  Branches          ?        0           
=========================================
  Hits              ?     7977           
  Misses            ?     8162           
  Partials          ?     1413

[nisdas]

Superseded by #5127