Add project_id to data_project

[EliiseS]

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• I have updated the documentation accordingly.
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• All new and existing tests passed.
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What about the current behavior has changed?

Issue Number: closes #162

Does this introduce a change to go.mod, go.sum or vendor/?

• No

Does this introduce a breaking change?

• No

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Other information

[EliiseS]

It might be worth removing the project_name field and just having the project_id field accept both. Didn't do that atm because of breaking changes, but it's an easy change

[xuzhang3]

LGTM