Modify SnapshotTracer to generate JSON

[shirleyyzhang]

Proposed Changes

(Describe your changes here. Also describe the motivation for your changes: what problem do they solve, or how do they improve the application or codebase? If this pull request fixes an open issue, use a keyword to link this pull request to the issue.)

• This PR modifies SnapshotTracer to generate JSON and pass it into the webstepper template as part of ongoing work towards integration with MemoryViz.
• snapshot_to_json function was modified to handle compound data types during recursive processing.

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Type of Change

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Type	Applies?
🚨 Breaking change (fix or feature that would cause existing functionality to change)	X
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🚦 Test update (change that only adds or modifies tests)
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Questions and Comments

[coveralls]

Coverage Report for CI Build 26258168223

Warning

Build has drifted: This PR's base is out of sync with its target branch, so coverage data may include unrelated changes.
Quick fix: rebase this PR. Learn more →

Coverage remained the same at 90.539%

Details

• Coverage remained the same as the base build.
• Patch coverage: No coverable lines changed in this PR.
• No coverage regressions found.

Uncovered Changes

No uncovered changes found.

Coverage Regressions

No coverage regressions found.

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Coverage Stats

Relevant Lines:	3879
Covered Lines:	3512
Line Coverage:	90.54%
Coverage Strength:	17.57 hits per line

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💛 - Coveralls

[david-yz-liu]

Hi @shirleyyzhang, great progress. I left one inline comment. Please also remove the output_directory attribute of the SnapshotTracer class, as it's no longer being used.

To maintain backwards compatibility you can leave the argument in the initializer, but if it is provided please use warnings.warn (import warnings) to emit a message saying that this argument is deprecated.

[david-yz-liu]

I don't think this method is really necessary any more, please just put the body inline above