Moved the `file_size` field from `Item` to `ItemMetaData`

[dpp]

💻 Description of Change(s) (w/ context)

Moved the file_size field from Item to ItemMetaData

🧠 Rationale Behind Change(s)

The Item record is supposed to be the enveloped that describes the relationships among graph items and the ItemMetaData field is supposed to be the field that contains the data (e.g., file names, file size, etc.) about the record

📝 Test Plan

Tested that the code works correctly with the generic_metadata branch of Big Tent

📜 Documentation

No documentation as the move was simple

💣 Quality Control

(All items must be checked before a PR is merged) Did you…

• [No ] Mention an issue number in the PR title?
• [ x] Update the version # in the build file?
• [ x] Create new and/or update relevant existing tests?
• [ x] Create or update relevant documentation and/or diagrams?
• [ x] Comment your code?
• [ x] Fix any stray verbose logging (removing, or moving to debug / trace level)?

Before Merging…

• Make sure the Quality Control boxes are all ticked
• Make sure any open comments or conversations on the PR are resolved

[earldouglas]

The build is failing, but I don't think it's due to anything on our side:

Run sbt test
/home/runner/work/_temp/644f807c-38a6-4265-b367-79c05f743b62.sh: line 1: sbt: command not found

https://github.com/spice-labs-inc/goatrodeo/actions/runs/11351528638/job/31572292734?pr=22