feat: separate accessibility of basic counts from detailed summary stats

[ymarcon]

As reported by @tomkuipers1402

In Mica there is an option for "Restricted access to variable summary statistics". Is it possible to separate this checkbox into 2 options:

1. Basic counts
2. Detailed summary stats

[ymarcon]

Currently catalog has either open or restricted access:

• open
  • signin not required to see catalog
  • general summary visibility policy applies
• restricted
  • signin is required to see catalog
  • summary visibility policy is de-facto statisfied

A more advanced use case to cover (@tomkuipers1402):

• not-so-open
  • signin not required to see catalog
  • dataset specific summary visibility policy applies