feat: config to adjust unchecked flush interval

[zengchen221]

Proposed changes in this pull request

• config to adjust unchecked flush interval

Type

• Bug fix: (Link to the issue #{issue No.})
• Feature (Non-breaking change)
• Feature (Breaking change)
• Documentation Improvement

Checklist

Write a small comment explaining if its N/A (not applicable)

• Read the CONTRIBUTION.
• All the tests are passing after the introduction of new changes.
• Added tests respective to the part of code I have written.
• Added proper documentation where ever applicable.
• Code has been written according to Golang-Style-Guide

Extra information

Any extra information related to this pull request.

[codecov]

Codecov Report

Merging #1297 (518ef2c) into master (f87d47d) will decrease coverage by 0.03%.
The diff coverage is 72.41%.

@@            Coverage Diff             @@
##           master    #1297      +/-   ##
==========================================
- Coverage   68.58%   68.55%   -0.04%     
==========================================
  Files         329      329              
  Lines       36696    36726      +30     
==========================================
+ Hits        25169    25177       +8     
- Misses       7604     7624      +20     
- Partials     3923     3925       +2     

Flag	Coverage Δ
unittests	68.55% <72.41%> (-0.04%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
ledger/ledger_uncheck.go	51.64% <55.88%> (+0.46%)	⬆️
ledger/ledger.go	64.96% <93.33%> (+0.46%)	⬆️
config/config_v10_testnet.go	100.00% <100.00%> (ø)
ledger/cache.go	77.77% <100.00%> (+0.08%)	⬆️
rpc/api/ledger.go	62.02% <100.00%> (ø)
consensus/dpos/processor.go	57.50% <0.00%> (-1.20%)	⬇️
p2p/sync.go	60.15% <0.00%> (-0.80%)	⬇️
consensus/pov/pov_sync.go	57.92% <0.00%> (-0.55%)	⬇️
consensus/pov/pov_chain.go	59.88% <0.00%> (-0.28%)	⬇️
consensus/dpos/dpos_impl_testnet.go	68.46% <0.00%> (-0.14%)	⬇️
... and 2 more

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