add nwp source to api

[peterdudfield]

Pull Request

Description

Added nwp source to api

This helps with openclimatefix/global-solar-forecast#7

How Has This Been Tested?

• CI tests

Checklist:

• My code follows OCF's coding style guidelines
• I have performed a self-review of my own code
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• I have checked my code and corrected any misspellings

[sentry]

🔍 Existing Issues For Review

Your pull request is modifying functions with the following pre-existing issues:

📄 File: api/v1/api.py

Function	Unhandled Issue
forecast	KeyError: 'timestamp' /forecast/ Event Count: 10
forecast	TypeError: '<' not supported between instances of 'int' and 'datetime.datetime' ... Event Count: 8
forecast	UnboundLocalError: cannot access local variable 'live_generation_df' where it is not associated with a value ... Event Count: 2
forecast	NameError: name 'data' is not defined /forecast/ Event Count: 1
forecast	AttributeError: 'NoneType' object has no attribute 'values' ... Event Count: 1

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