[FDC] Add seed data for the initial template

[fredzqm]

Tested the seed data executed successfully against local pglite, against ephemeral database & CSQL in prod.

I used the seed data in web code lab as a starting point and trim down unknown tables and columns.
https://github.com/FirebaseExtended/codelab-dataconnect-web/blob/main/dataconnect/moviedata_insert.gql

Grouped FDC related changelog together. We have a lot going out this week.

[gemini-code-assist]

Summary of Changes

Hello @fredzqm, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the Data Connect initial template by incorporating a seed_data.gql file. This file contains GraphQL mutations designed to pre-populate the template with sample data for movies, movie metadata, users, and reviews, making it easier for developers to get started with a functional dataset immediately upon initialization.

Highlights

• Seed Data Addition: Introduced a new seed_data.gql file to provide initial sample data for the Data Connect movie template, including movies, metadata, users, and reviews.
• Template Integration: The newly added seed data template is now integrated into the Data Connect initialization process, ensuring new projects start with pre-populated data.
• Changelog Update: The CHANGELOG.md file has been updated to reflect the addition of seed_data.gql to the initial movie template.

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[gemini-code-assist]

Code Review

This pull request adds seed data to the Data Connect movie template, which will improve the initial user experience by providing sample data. The changes include adding a seed_data.gql file with GraphQL mutations for movies, metadata, users, and reviews. The initialization logic is updated to handle this new seed data file.

My review has identified a few minor issues:

• The changelog entry has an empty placeholder.
• There are a couple of typos in image URLs within the new seed data file.

Fixing these will improve the quality of the template. Overall, this is a good addition.