Add description/columns to ModelNodeArgs so that plugins ingest description/columns to manifest.json

[toukoudo]

Resolves #11527

Problem

• As far as I know, currently, plugins cannot ingest document/column information for external nodes, resulting in no descriptions or column details appearing in manifest.json for these nodes
• I would like to be able to see description and column information for plugin-ingested nodes in the manifest output

Solution

• Add columns/description fields to ModelNodeArgs so that plugins can ingest them

Checklist

• I have read the contributing guide and understand what's expected of me.
• I have run this code in development, and it appears to resolve the stated issue.
• This PR includes tests, or tests are not required or relevant for this PR.
• This PR has no interface changes (e.g., macros, CLI, logs, JSON artifacts, config files, adapter interface, etc.) or this PR has already received feedback and approval from Product or DX.
• This PR includes type annotations for new and modified functions.

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[toukoudo]

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