DPL Analysis: Generalize aod-spawner

[aalkin]

• Add serialization for framework::expressions
• Add serialization for simple arrow::Schema
• Add serialized expressions and schema to DYN input spec metadata
• Make aod-spawner generic by relying on serialized expression metadata

[github-actions]

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[ktf]

Tested on hyperloop, test which was previously failing now works as expected. Merging.