DS-1812: move datasources utils to datasources/common

[bohutang]

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Summary

move datasources utils to datasources/common, this PR:

1. split the common to part.rs and line.rs

Changelog

• Improvement

Related Issues

Fixes #1812

Test Plan

Unit Tests

Stateless Tests

[databend-bot]

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[codecov-commenter]

Codecov Report

Merging #1813 (d543aad) into master (5282e51) will not change coverage.
The diff coverage is 93%.

@@          Coverage Diff           @@
##           master   #1813   +/-   ##
======================================
  Coverage      70%     70%           
======================================
  Files         629     631    +2     
  Lines       37486   37486           
======================================
  Hits        26423   26423           
  Misses      11063   11063           

Impacted Files	Coverage Δ
query/src/datasources/common/line_test.rs	87% <87%> (ø)
query/src/datasources/common/line.rs	92% <92%> (ø)
query/src/datasources/common/part.rs	94% <94%> (ø)
query/src/datasources/common/part_test.rs	100% <100%> (ø)
query/src/datasources/local/csv_table.rs	75% <100%> (ø)
query/src/datasources/local/memory_table.rs	87% <100%> (ø)
query/src/datasources/system/numbers_table.rs	79% <100%> (ø)
... and 1 more

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[dantengsky]

LGTM

[databend-bot]

CI Passed
Reviewer Approved
Let's Merge