[DOP-14492] - Teradata supports passing custom versions

[maxim-lixakov]

Change Summary

• Teradata connection now uses Teradata JDBC driver 20.00.00.19, upgraded from 17.20.00.15, and supports passing custom versions: Teradata.get_packages(package_version=...).
• Update following documentation and tests.

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 94.39%. Comparing base (8e0dc89) to head (ea31897).
Report is 2 commits behind head on develop.

❗ Current head ea31897 differs from pull request most recent head 4f945fa. Consider uploading reports for the commit 4f945fa to get more accurate results

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #256   +/-   ##
========================================
  Coverage    94.39%   94.39%           
========================================
  Files          204      204           
  Lines         7901     7904    +3     
  Branches      1402     1402           
========================================
+ Hits          7458     7461    +3     
  Misses         318      318           
  Partials       125      125           

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