[DOP-15764] Remove fetchsize from JDBCWriteOptions

[dolfinus]

Change Summary

Currently JDBC.WriteOptions have fetchsize option. This should not be the case.

Instead of inheriting JDBC.ReadOptions, JDBC.SQLOptions and JDBC.WriteOptions from legacy JDBC.JDBCOptions, inherit them from GenericOptions. Copy query_timeout` to both of these classes, as Spark can accept this option in both read and write operations.

Related issue number

Checklist

• Commit message and PR title is comprehensive
• Keep the change as small as possible
• Unit and integration tests for the changes exist
• Tests pass on CI and coverage does not decrease
• Documentation reflects the changes where applicable
• docs/changelog/next_release/<pull request or issue id>.<change type>.rst file added describing change
  (see CONTRIBUTING.rst for details.)
• My PR is ready to review.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.79%. Comparing base (fc9c750) to head (a6deb0e).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #288   +/-   ##
========================================
  Coverage    94.78%   94.79%           
========================================
  Files          210      210           
  Lines         8172     8185   +13     
  Branches      1409     1409           
========================================
+ Hits          7746     7759   +13     
  Misses         304      304           
  Partials       122      122           

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