Beam Programming Guide: Add Python version of Section 6.6 "Using Schema Transforms"

[damccorm]

Imported from Jira BEAM-13338. Original Jira may contain additional context.
Reported by: bhulette.
Subtask of issue #21182

[Midhat-kazmi]

Hi, I’m a new contributor. I’d like to work on this issue (adding the Python examples for Schema Transforms). Is it okay if I take this one?

[damccorm]

Sure, you can self assign it by commenting .take-issue

[Midhat-kazmi]

.take-issue

[Midhat-kazmi]

PR opened: #37534

Output of git status after deleting file:
On branch add-python-schema-transforms
nothing to commit, working tree clean

Commit success message:
Add Python example for schema transforms field selection

Push success:
Pushed successfully to remote branch add-python-schema-transforms

PR link:
#37534