Add entropy correctness test

[ulbqb]

Description

PR #559 adds Entropy to Block and says that Entropy is single at every height. But that was not tested. So this PR adds a test that checks Entropy is single in every height. The following items need to be confirmed:

• BlockID has Markle roots of a block.
  • BlockID has PartSetHeader that has Markle roots of a block. Please see the following implementations.
  • https://github.com/line/ostracon/blob/7ca9a208a1729226638c503e019513ae3c8b76dd/types/part_set.go#L209-L217
    https://github.com/line/ostracon/blob/7ca9a208a1729226638c503e019513ae3c8b76dd/types/block.go#L171-L190
    https://github.com/line/ostracon/blob/7ca9a208a1729226638c503e019513ae3c8b76dd/types/part_set.go#L167-L195
• A block with different Entropy has a different BlockID.
  • This was not tested. So this PR adds this test.
• Signature of Vote with wrong PartSetHeader is invalid.
  • This was not tested. So this PR adds this test.
• All validators agree on the same Block.PartSetHeader as well as BlockID.Hash.
  • Since Commit has only one BlockID, all validators agree on the same Block.PartSetHeader.

Closes: #XXX

[codecov]

Codecov Report

Merging #565 (413d63a) into main (7ca9a20) will increase coverage by 0.01%.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #565      +/-   ##
==========================================
+ Coverage   66.07%   66.08%   +0.01%     
==========================================
  Files         278      277       -1     
  Lines       36999    36946      -53     
==========================================
- Hits        24446    24416      -30     
+ Misses      10791    10773      -18     
+ Partials     1762     1757       -5     

Impacted Files	Coverage Δ
crypto/sr25519/pubkey.go	35.89% <0.00%> (-7.70%)	⬇️
p2p/switch.go	65.08% <0.00%> (-1.45%)	⬇️
p2p/pex/pex_reactor.go	79.67% <0.00%> (-0.62%)	⬇️
light/client.go	72.79% <0.00%> (ø)
blockchain/v0/pool.go	79.58% <0.00%> (ø)
proxy/multi_app_conn.go	47.66% <0.00%> (ø)
libs/rand/sampling.go
consensus/reactor.go	74.97% <0.00%> (+0.26%)	⬆️
types/block.go	79.58% <0.00%> (+0.36%)	⬆️
p2p/conn/connection.go	80.38% <0.00%> (+0.57%)	⬆️
... and 6 more

[torao]

Just the wording, but "uniqueness" asserts that "never duplicates" (i.e. can be used for such as primary keys or node ids); verification and correctness seem better in terms of Entropy's behaviour and this test.

[Kynea0b]

LGTM

[ulbqb]

Just the wording, but "uniqueness" asserts that "never duplicates" (i.e. can be used for such as primary keys or node ids); verification and correctness seem better in terms of Entropy's behaviour and this test.

@torao
I see. I'll use "correctness" or "single" instead of "uniqueness".