feat: signature verification cache (#41)

[jinsan-line]

Epic: line/lbm#1258

Cherry-pick: #41

Description

• During checking a tx, if it succeed to verify the signatures, keep it in txHashCache as [account_number:sequence]: tx_hash
• When delivering or rechecking a tx, we could look up txHashCache to check whether it's already verified.
• When delivering a tx, if txHashCache doesn't have a entry or the txHash is not same, we'll verify it again w/ VerifyBytes()
• When rechecking a tx, SigVerificationDecorator is executed as well for https://github.com/line/link/issues/1136

Motivation and context

Signature verification is cpu intensive task. It could be executed repeatedly for the same transaction so, if we keep the verified the transactions, it could save cpu time and improve the performance.

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• Targeted PR against correct branch (see CONTRIBUTING.md)
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• Code follows the module structure standards.
• Wrote unit and integration tests
• Updated relevant documentation (docs/) or specification (x/<module>/spec/)
• Added relevant godoc comments.
• Added a relevant changelog entry to the Unreleased section in CHANGELOG.md
• Re-reviewed Files changed in the Github PR explorer
• Review Codecov Report in the comment section below once CI passes

[codecov]

Codecov Report

Merging #143 (3f71b8a) into v2/develop (1f739c5) will increase coverage by 1.52%.
The diff coverage is 72.94%.

❗ Current head 3f71b8a differs from pull request most recent head 38044c2. Consider uploading reports for the commit 38044c2 to get more accurate results

@@              Coverage Diff               @@
##           v2/develop     #143      +/-   ##
==============================================
+ Coverage       54.99%   56.52%   +1.52%     
==============================================
  Files             812      805       -7     
  Lines           51487    49530    -1957     
==============================================
- Hits            28317    27995     -322     
+ Misses          20211    18594    -1617     
+ Partials         2959     2941      -18     

Impacted Files	Coverage Δ
client/grpc/tmservice/query.pb.gw.go	30.06% <ø> (ø)
simapp/test_helpers.go	0.49% <0.00%> (-0.01%)	⬇️
testutil/network/network.go	86.26% <0.00%> (ø)
types/address.go	65.71% <ø> (ø)
types/config.go	84.61% <ø> (ø)
x/auth/client/rest/broadcast.go	40.90% <0.00%> (ø)
x/auth/types/query.pb.gw.go	0.89% <ø> (ø)
x/bank/types/query.pb.gw.go	0.00% <ø> (ø)
x/distribution/types/query.pb.gw.go	0.00% <ø> (ø)
x/evidence/types/query.pb.gw.go	0.00% <ø> (ø)
... and 58 more