Remove deprecated code for unsupported types

[aaravnavani]

This PR fixes this issue and

• Removes the Email, URL, PythonCode, and SQLCode classes as those are deprecated past version 0.3.0
• Changes the warning to say version 0.4.0 instead of 0.3.0

[CalebCourier]

Hey @aaravnavani, thanks for starting these changes. I left a few comments for a few additional removals. Once those are done and the tests are updated we should be good to go. I noticed this was still in draft so I wanted to check if your were still planning to continue work on the PR or if you mind if we co-op it?

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

❗ No coverage uploaded for pull request base (main@33bd89d). Click here to learn what that means.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #605   +/-   ##
=======================================
  Coverage        ?   80.86%           
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  Files           ?      119           
  Lines           ?     6902           
  Branches        ?        0           
=======================================
  Hits            ?     5581           
  Misses          ?     1321           
  Partials        ?        0           

Flag	Coverage Δ
unittests	80.86% <100.00%> (?)

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[aaravnavani]

@CalebCourier Just made some additional removals and updated the tests.

[CalebCourier]

Nice work! I'm going to merge this onto a feature branch for further testing. I'll link back here so you can see it.