feat: reader split

[arjenzhou]

What is the purpose of the change

#1

Brief changelog

support reader split

Verifying this change

Checklist

• Make sure there is a ISSUE field for the change (usually
  before you start working on it). Trivial changes like typos do not require a GitHub issue. Your pull request should
  address just this issue, without pulling in other changes - one PR resolves one issue.
• Each commit in the pull request should have a meaningful subject line and body.
• Write a pull request description that is detailed enough to understand what the pull request does, how, and why.
• Write necessary unit-test to verify your logic correction, more mock a little better when cross module dependency
  exist. If the new feature or significant change is committed, please remember to add sample in project.
• Add some description to documents if you are requesting to add a feature.
• GitHub Actions works fine on your own branch.

[codecov]

Codecov Report

Merging #46 (e57c3da) into master (503864d) will increase coverage by 2.00%.
The diff coverage is 66.18%.

@@             Coverage Diff              @@
##             master      #46      +/-   ##
============================================
+ Coverage     49.71%   51.72%   +2.00%     
- Complexity      163      173      +10     
============================================
  Files            46       46              
  Lines          1058     1131      +73     
  Branches         65       71       +6     
============================================
+ Hits            526      585      +59     
- Misses          492      503      +11     
- Partials         40       43       +3     

Impacted Files	Coverage Δ
.../xab/porter/api/dataconnection/SinkConnection.java	84.84% <ø> (-1.64%)	⬇️
...b/porter/common/util/PorterNetworkInterceptor.java	0.00% <0.00%> (ø)
...e/xab/porter/transfer/http/writer/DorisWriter.java	0.00% <0.00%> (ø)
...e/xab/porter/transfer/jdbc/writer/DorisWriter.java	0.00% <ø> (ø)
.../porter/transfer/jdbc/writer/PostgreSQLWriter.java	0.00% <0.00%> (ø)
.../de/xab/porter/transfer/writer/AbstractWriter.java	65.51% <ø> (+4.22%)	⬆️
...de/xab/porter/transfer/jdbc/writer/JDBCWriter.java	50.00% <42.85%> (-1.71%)	⬇️
core/src/main/java/de/xab/porter/core/Task.java	76.62% <65.95%> (-10.88%)	⬇️
...de/xab/porter/transfer/jdbc/reader/JDBCReader.java	66.66% <73.07%> (+2.73%)	⬆️
...orter/transfer/jdbc/connector/HikariConnector.java	72.72% <75.00%> (ø)
... and 8 more

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