Add some utilities for later crypto use.

[abacabadabacaba]

No description provided.

[bowenwang1996]

this is also outdated syntax. :: is not necessary. Also Option is imported in prelude by default so it suffices to write Some(v).

[abacabadabacaba]

Well, this will make it always use Some from std, rather than whatever Some is in scope at macro invocation site. Although it is probably not the best idea to define e.g. a local variable named Some.

[bowenwang1996]

Okay then I suggest using std::option::Option::Some.

[abacabadabacaba]

Then it will break if there is something named std in scope. Leading :: forces the following identifier to be interpreted as a library name.

[codecov]

Codecov Report

Merging #2104 into staging will increase coverage by <.01%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##           staging    #2104      +/-   ##
===========================================
+ Coverage    86.92%   86.92%   +<.01%     
===========================================
  Files          179      180       +1     
  Lines        34271    34273       +2     
===========================================
+ Hits         29791    29793       +2     
  Misses        4480     4480

Impacted Files	Coverage Δ
core/crypto/src/vrf.rs	100% <100%> (+1.94%)	⬆️
core/crypto/src/util.rs	100% <100%> (ø)
chain/chunks/src/types.rs	0% <0%> (-25%)	⬇️
core/primitives/src/types.rs	94.11% <0%> (-3.53%)	⬇️
chain/network/src/test_utils.rs	89.36% <0%> (-3.2%)	⬇️
chain/client/src/sync.rs	86.43% <0%> (-1.49%)	⬇️
chain/client/src/client.rs	93.43% <0%> (-1%)	⬇️
chain/client/tests/chunks_management.rs	96.23% <0%> (-0.84%)	⬇️
chain/chain/src/validate.rs	90.14% <0%> (-0.37%)	⬇️
runtime/runtime/src/state_viewer.rs	92.35% <0%> (-0.24%)	⬇️
... and 26 more

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