Serialize NaN and Infinity values as strings for Hamilton UI

[Phrogz]

Fix it so that NaN and Infinity floats do not throw an error when being passed to Hamilton UI.

Changes

This commit uses json.dumps(…, allow_nan=False), which raises a ValueError for such values, and in that case converts them to strings.

The result is that Hamliton UI will show such values as strings "nan", "inf", and "-inf".
This could be confusing only to users who are also using such string values.

How I tested this

Created failing unit tests, patched the code, ensured the failing tests now pass.

Ran test code from #1310 and confirmed that runs made with this fix show up, they just show "nan" as the input value for the run.

Ran all unit tests; while some fail, they also failed before this fix.

Notes

Float values that are "out of range" were previously serialized—to send to the tracker/Hamilton UI—in a way that produced invalid JSON (but value JS), which caused a runtime error trying to send values to the tracker.

math.nan, math.inf, and -math.inf are serialized by json.dumps() to NaN, Infinity, and -Infinity values by default(NOT as strings).

Fixes #1310

Checklist

• PR has an informative and human-readable title (this will be pulled into the release notes)
• Changes are limited to a single goal (no scope creep)
• Code passed the pre-commit check & code is left cleaner/nicer than when first encountered.
• Any change in functionality is tested
• New functions are documented (with a description, list of inputs, and expected output)
• Placeholder code is flagged / future TODOs are captured in comments
• Project documentation has been updated if adding/changing functionality.