Speed Improvements for UI - First Pass

[braddf]

Pull Request

Description

Speed up UI:

• Replace all GSP call with single GSP
• Add Loading states and Indicators in UI for separate API calls
• De-duplicate API calls in UI in general (max. once every 2 mins not continually)

Fixes #392 and #365

How Has This Been Tested?

Tested on development for the past few days

• [x] Yes

Checklist:

• [x] My code follows OCF's coding style guidelines
• [x] 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
• [x] I have checked my code and corrected any misspellings

[vercel[bot]]

The latest updates on your projects. Learn more about Vercel for Git ↗︎

Name	Status	Preview	Updated (UTC)
nowcasting-app	✅ Ready (Inspect)	Visit Preview	Aug 14, 2023 7:41pm
nowcasting-website	✅ Ready (Inspect)	Visit Preview	Aug 14, 2023 7:41pm

[peterdudfield]

we should get this one in first right - https://github.com/openclimatefix/nowcasting/pull/400