feat: Onboard Fec dataset

[gkodukula]

Description

Dataset: FEC

• FEC Committee Contributions
• 2016 FEC Candidate Committee
• 2016 FEC Candidate
• 2016 FEC Opex
• 2016 Other Committee Tx
• 2016 FEC Committee
• 2016 FEC Individuals
• 2018 FEC Committee
• 2018 FEC Opex
• 2018 FEC Committee Contributions
• 2018 FEC Candidate Committee
• 2018 FEC Other Committee Tx
• 2018 FEC Candidate
• 2020 FEC Candidate Committee
• 2020 FEC Candidate
• 2020 FEC Other Committee Tx
• 2020 FEC Committee
• 2020 FEC Committee Contributions
• 2020 FEC Opex
• 2020 FEC Individuals - Step 3: Ingest

Checklist

• (Required) This pull request is appropriately labeled
• Please merge this pull request after it's approved

Use the sections below based on what's applicable to your PR and delete the rest:

Feature

• I'm adding or editing a feature
• I have updated the README accordingly
• I have added/revised tests for the feature

Data Onboarding

• I'm adding or editing a dataset
• The Google Cloud Datasets team is aware of the proposed dataset
• I put all my code inside datasets/fec and nothing outside of that directory