DPL Analysis: Expressions <-> JSON

[aalkin]

• add serialization/deserialization support for expressions
• add test

[github-actions]

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[alibuild]

Error while checking build/O2/fullCI_slc9 for 7d58894 at 2025-11-07 05:24:

No log files found

Full log here.

[aalkin]

Closing in favor of #14808