Implement data upload in eGRID data fetcher

[ryanhu021]

Description
Our eGRID data fetcher successfully fetches the data from the EPA website, but it currently only returns the data in the response rather than writing it to our MongoDB collection.

Modify the transformEgridData() function to convert each object into an EgridRecord type, and populate the database with each record.

Acceptance Criteria
The database is populated with the fetched eGRID data with a request to /api/egrid.

Steps:

• Modify the function transformEgridData() in src/services/egrid-fetch.ts to convert an object corresponding to an eGRID record into an EgridRecord
• In app/egrid/route.ts:
  • Iterate over the EgridRecord objects in transformedData and call addEgridRecord() for each to save them as a document in the collection
  • Update the response to remove the transformed data and return success or failure on upload

Additional Information