FIX:fatal error: concurrent map read and map write(apache#544)

[feiquan123]

What is the purpose of the change

avoid fatal error: concurrent map read and map write

Brief changelog

use sync.Map to save localFileOffsetStore.OffsetTable info.

Verifying this change

go test . -v --run TestNewLocalFileOffsetStore pass
go test . -v --run TestLocalFileOffsetStore pass

[codecov-io]

Codecov Report

Merging #546 into v2.0.0 will decrease coverage by 0.28%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           v2.0.0     #546      +/-   ##
==========================================
- Coverage   24.65%   24.37%   -0.29%     
==========================================
  Files          48       47       -1     
  Lines        5614     4887     -727     
==========================================
- Hits         1384     1191     -193     
+ Misses       4033     3504     -529     
+ Partials      197      192       -5     

Impacted Files	Coverage Δ
consumer/mock_offset_store.go	57.14% <ø> (+7.14%)	⬆️
consumer/offset_store.go	64.39% <100.00%> (-0.29%)	⬇️
internal/utils/net.go	40.00% <0.00%> (-7.37%)	⬇️
consumer/lock.go	33.33% <0.00%> (-6.67%)	⬇️
internal/remote/tcp_conn.go	60.00% <0.00%> (-6.67%)	⬇️
internal/model.go	43.37% <0.00%> (-3.37%)	⬇️
internal/remote/codec.go	57.14% <0.00%> (-2.94%)	⬇️
producer/selector.go	71.05% <0.00%> (-2.87%)	⬇️
consumer/strategy.go	72.72% <0.00%> (-2.64%)	⬇️
internal/remote/remote_client.go	50.63% <0.00%> (-2.48%)	⬇️
... and 40 more

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[ShannonDing]

Hi， could you pls check this issue in the master, and move the pr to master.

[feiquan123]

ok, master branch too. I will move the pr to master.

[ShannonDing]

duplicate with #550