enhancement: delegate connect action to Connector

[arjenzhou]

What is the purpose of the change

#34

Brief changelog

Verifying this change

Checklist

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[codecov]

Codecov Report

Merging #35 (65bd538) into master (365f73b) will increase coverage by 0.75%.
The diff coverage is 69.01%.

@@             Coverage Diff              @@
##             master      #35      +/-   ##
============================================
+ Coverage     57.90%   58.66%   +0.75%     
- Complexity      154      159       +5     
============================================
  Files            35       37       +2     
  Lines           879      912      +33     
  Branches         58       62       +4     
============================================
+ Hits            509      535      +26     
- Misses          329      334       +5     
- Partials         41       43       +2     

Impacted Files	Coverage Δ
.../porter/transfer/jdbc/connector/JDBCConnector.java	0.00% <ø> (-68.19%)	⬇️
.../porter/transfer/jdbc/writer/PostgreSQLWriter.java	0.00% <0.00%> (ø)
.../de/xab/porter/transfer/connector/Connectable.java	0.00% <ø> (ø)
...va/de/xab/porter/transfer/connector/Connector.java	0.00% <0.00%> (ø)
...java/de/xab/porter/common/spi/ExtensionLoader.java	74.75% <60.71%> (+6.27%)	⬆️
.../xab/porter/api/dataconnection/DataConnection.java	62.26% <66.66%> (+0.56%)	⬆️
.../de/xab/porter/transfer/reader/AbstractReader.java	71.42% <69.23%> (-3.58%)	⬇️
...orter/transfer/jdbc/connector/HikariConnector.java	72.72% <72.72%> (ø)
...de/xab/porter/transfer/jdbc/writer/JDBCWriter.java	50.34% <77.77%> (-1.01%)	⬇️
...de/xab/porter/transfer/jdbc/reader/JDBCReader.java	62.90% <81.81%> (ø)
... and 5 more

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