This commit optimizes `PortfolioSnapshot` instantiation when loaded from the DB or JSON dictionaries by removing the immediate `json.loads(holdings_snapshot)` parsing inside the `from_dict` constructor. Instead, it overrides `__getattribute__` to implement a lazy-loading pattern, where the `holdings_snapshot` string is only parsed into a Python dictionary the very first time the field is accessed.
This optimization ensures that parsing large JSON payloads doesn't block the instantiation of snapshots, which is particularly beneficial in workflows that load a large historical series of snapshots but never access their `holdings_snapshot` field.
Co-authored-by: aguzererler <6199053+aguzererler@users.noreply.github.com>
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