[backup] Improved writing and reading of blockchain backup file

[0xcb9ff9]

Description

• reading and writing use separate goroutine
• read block use BlockByNumber, circumventing block range limits (grpc load balancing is now available)

Changes include

• Bugfix (non-breaking change that solves an issue)
• New feature (non-breaking change that adds functionality)

Checklist

• I have assigned this PR to myself
• I have added at least 1 reviewer
• I have added the relevant labels

Testing

• I have tested this code with the official test suite
• I have tested this code manually

Manual tests

create backup

dogechain backup --from 1 --to 100 --zstd --out blockchain.bin.zstd

restore backup

dogechain server --chain ./genesis.json --restore blockchain.bin.zstd --data-dir ./data

[codecov-commenter]

Codecov Report

Merging #297 (9c975d6) into dev (a840ee8) will decrease coverage by 3.54%.
The diff coverage is 40.75%.

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@@            Coverage Diff             @@
##              dev     #297      +/-   ##
==========================================
- Coverage   51.21%   47.67%   -3.54%     
==========================================
  Files         117      131      +14     
  Lines       17525    19836    +2311     
==========================================
+ Hits         8975     9457     +482     
- Misses       7789     9561    +1772     
- Partials      761      818      +57     

Impacted Files	Coverage Δ
blockchain/storage/kvstorage/kvstorage.go	54.16% <ø> (+2.46%)	⬆️
chain/chain.go	28.69% <ø> (ø)
consensus/ibft/hooks.go	55.26% <ø> (ø)
consensus/ibft/pos.go	0.00% <0.00%> (ø)
helper/keccak/keccak.go	0.00% <ø> (ø)
helper/keccak/pool.go	0.00% <ø> (ø)
jsonrpc/debug_endpoint.go	36.08% <0.00%> (-0.76%)	⬇️
jsonrpc/net_endpoint.go	0.00% <0.00%> (ø)
network/bootnodes.go	85.71% <ø> (-14.29%)	⬇️
network/connections.go	98.07% <ø> (ø)
... and 131 more

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[DarianShawn]

Thanks for your great job.
I do like the producer consumer multithreading model.
Only a few questions left.

[DarianShawn]

LGTM