Change VRF function names: check -> is_valid, check_vrf -> is_vrf_valid.

[abacabadabacaba]

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[codecov]

Codecov Report

Merging #2106 into staging will decrease coverage by 0.01%.
The diff coverage is 87.5%.

@@             Coverage Diff             @@
##           staging    #2106      +/-   ##
===========================================
- Coverage    86.78%   86.77%   -0.02%     
===========================================
  Files          178      179       +1     
  Lines        34034    34190     +156     
===========================================
+ Hits         29536    29667     +131     
- Misses        4498     4523      +25

Impacted Files	Coverage Δ
core/crypto/src/vrf.rs	98.07% <100%> (+0.03%)	⬆️
core/crypto/src/key_conversion.rs	86.95% <86.95%> (ø)
chain/network/tests/churn_attack.rs	89.47% <0%> (-5.27%)	⬇️
chain/client/src/types.rs	59.01% <0%> (-1.64%)	⬇️
chain/client/src/sync.rs	84.56% <0%> (-1.47%)	⬇️
chain/client/src/client.rs	93.43% <0%> (-1.29%)	⬇️
chain/network/src/test_utils.rs	91.48% <0%> (-1.07%)	⬇️
chain/network/src/peer.rs	74% <0%> (-0.6%)	⬇️
chain/chain/src/test_utils.rs	85.09% <0%> (-0.19%)	⬇️
chain/client/src/client_actor.rs	83.44% <0%> (-0.17%)	⬇️
... and 37 more

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