feat(traits): build a saved trait no attached instance accounts for

[collindutter]

A saved parameter may have no trait instance for state to reach, such as an editor-added or runtime-grown parameter. Saved entries now identify the trait class, using stable library namespaces for dynamically loaded modules:

{
    "trait_name": "Options",
    "trait_module": "griptape_nodes.traits.options",
    "trait_state": {"choices": ["sdxl", "flux"]},
}

The loader updates a matching instance or constructs the named trait with its saved constructor state.

[codecov]

Codecov Report

❌ Patch coverage is 76.78571% with 26 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...ptape_nodes/retained_mode/managers/node_manager.py	67.10%	25 Missing ⚠️
src/griptape_nodes/traits/trait_resolver.py	96.55%	1 Missing ⚠️

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