feat added migration file and update api for forecast

[amanda-eames]

Description by Korbit AI

What change is being made?

Add a new migration file to introduce the ghgi_emission_forecast table and update the API query to fetch emission forecasts from this new database table.

Why are these changes being made?

This change allows the system to store and retrieve city-specific emissions forecast data more efficiently by creating a dedicated database table. The update to the API query ensures that it accesses the newly created table, enhancing the system's scalability by replacing hardcoded data with dynamic database storage.

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[korbit-ai]

Review by Korbit AI

Korbit automatically attempts to detect when you fix issues in new commits.

Category	Issue	Fix Detected
	Missing UUID generation and NOT NULL constraint for primary key ▹ view	✅

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