Support all the ICU collation order options

## Summary

Strings in view keys are sorted by the "root" ICU collation order, but other language-specific options are available. Expose this to users as a design document option (like include_design:true or collation:raw)

## Desired Behaviour

Expose this to users as a design document option (like include_design:true or collation:raw)

## Possible Solution

should be as simple as passing the option done once exposed at the couch_ejson_compare level

## Additional context

i18n is good

Start by reading the couch_ejson_compare entry point mentioned in the issue and trace how view-key strings receive the root ICU collation order. Determine how a design document option should expose the requested collation choices, then verify that view-key ordering reflects the selected option. The issue does not name specific files or tests.

Written by the indexing model from the issue text.