Feature: auto-populate Create Signal form with news data

[happy-devs]

Summary

This request:

• Introduces fetching current news stories based on user queries (eg "earthquake") to auto-populate the "Create Signal" form.

New Features

• Added add a signals autocomplete endpoint to allow for fetching recent stories using the News API, converted into the format of a signal

Bug Fixes

• I have read the contribution guidelines.
• My code follows the style guidelines of this project.
• I have performed a self-review of my code.
• I have commented my code, particularly in hard-to-understand areas.
• I have added tests that prove my fix is effective or that my feature works.
• I have added required dependencies to requirements.txt
• I have updated the documentation (if applicable).

Additional Notes

[claudiaRangel]

Thanks. looks good to me.