fix: add block validation on Fast Sync

[ulbqb]

Description

This PR enable to make block synchronization safer by performing block verification before persisting blocks during Fast Sync. This PR is same as tendermint/tendermint#8493.

Problem

In consensus, we always validate a block before voting and thereby before we persist it, however in blocksync it's possible to persist an invalid block as we only validate it afterwards (in ApplyBlock). This potentially puts the node in a bad state where it can't simply rollback the previous execution.

tendermint/tendermint#8493 (comment)

Fix

I added block validation before before persisting blocks.

[codecov]

Codecov Report

Merging #517 (e31f06a) into main (07a894b) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

❗ Current head e31f06a differs from pull request most recent head 3570b83. Consider uploading reports for the commit 3570b83 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #517      +/-   ##
==========================================
- Coverage   65.62%   65.60%   -0.02%     
==========================================
  Files         279      279              
  Lines       38032    38033       +1     
==========================================
- Hits        24957    24951       -6     
- Misses      11276    11283       +7     
  Partials     1799     1799              

Impacted Files	Coverage Δ
blockchain/v0/reactor.go	70.46% <100.00%> (+0.97%)	⬆️
libs/events/events.go	93.23% <0.00%> (-5.27%)	⬇️
types/tx.go	90.24% <0.00%> (-3.66%)	⬇️
p2p/switch.go	65.90% <0.00%> (-0.62%)	⬇️
blockchain/v0/pool.go	79.06% <0.00%> (-0.52%)	⬇️
p2p/pex/addrbook.go	71.57% <0.00%> (-0.51%)	⬇️
consensus/reactor.go	74.13% <0.00%> (-0.45%)	⬇️
consensus/state.go	73.47% <0.00%> (-0.15%)	⬇️
proxy/multi_app_conn.go	47.66% <0.00%> (ø)
types/voter_set.go	85.20% <0.00%> (+0.42%)	⬆️
... and 6 more

[Kynea0b]

LGTM