[DOCS] Revised glossary for GX 1.0

[Rachel-Reverie]

Description:

• Definitions provided for persisted objects in the GX Core Domain Model
• Definitions provided for additional objects referenced in the Docs
• Links from Definitions to relevant documentation on how to use/manage the object in question.

Definition of done:

• PR title is prefixed with one of: [BUGFIX], [FEATURE], [DOCS], [MAINTENANCE], [CONTRIB]
• Appropriate tests and docs have been updated

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.54%. Comparing base (edc1000) to head (87d2037).
Report is 1 commits behind head on develop.

Additional details and impacted files

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[jcampbell]

I did some word smithing on several of these, but I think there's a general issue that's worth tackling first...how do we want to describe the abstract concepts here that are part of configuration. We've got "object" "reference" "python class" "storage location"

I think the structure is hampering us a bit here. What if instead of A XXXX where XXXX is one of hte above, we were more descriptive, along the lines of...

Data Context: A Data Context stores all of the configuration for a project in Great Expectations, and provides an API to access each of the objects.