Is your feature request related to a problem? Please describe.
Get irradiance via Solcast API
https://solcast.com/solar-data-api/api/

Describe the solution you'd like
Use iotools to get irradiance data from Solcast

Describe alternatives you've considered
Solcast already has an API toolkit. Is irons redundant?

Additional context

• https://docs.solcast.com.au/#introduction
• https://solcast.com/solar-data-api/api-toolkit/
• icymi @AdamRJensen