[DOCS] Adds guidance around Checkpoints in 1.0

[Rachel-Reverie]

Definition of done

• Provides Checkpoint guidance for:
  • Creating a Checkpoint
  • Listing available Checkpoints
  • Getting a Checkpoint by name
  • Getting a list of Checkpoints by attributes
  • Updating a Checkpoints Validation Definitions and/or Actions
  • Deleting a Checkpoint

Notes:

• The section for "Run a Checkpoint" will be filled in with a later PR.
• The example code has been moved into Python scripts, but they are not yet under test. That will be done in a future PR, when the API for Checkpoints and Batch Definitions is more complete.

Definition of done:

• PR title is prefixed with one of: [BUGFIX], [FEATURE], [DOCS], [MAINTENANCE], [CONTRIB]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.55%. Comparing base (ab02092) to head (17d28e6).

Additional details and impacted files

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##           develop    #9675   +/-   ##
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  Coverage    82.55%   82.55%           
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  Files          511      511           
  Lines        46383    46383           
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  Hits         38293    38293           
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