Reduce default CosmosDB throughput to 400 in the Azure provider

[javiertoledo]

It's currently set to 4000, which is nice for running load tests but can cause unexpected database costs for people that are unaware of this setting and want to use Azure.

Ideally, this parameter of the Azure provider should be configurable.

[heavylemon1]

Hi @javiertoledo, I saw this issue is still open and wanted to know if I can be assigned it. I haven't contributed to booster before, but I think I can get the hang of this one :smile: .

Thanks!

[javiertoledo]

Sure thing, thanks!

[heavylemon1]

Thanks @javiertoledo !