Add geo-awareness into Availability API requests

### Proposal

Requests from Open Library (already attaching `x-preferred-client-ip` headers) will need to include `x-preferred-client-useragent` and `x-preferred-client-jurisdiction` (two-character geoip location country code) along with the request.

This issue can be resolved once:
* [ ] Open Library updated nginx to deduce the jurisdiction from an IP at nginx level, related to #10139
* [ ] core.lending code passes this jurisdiction along to the bulk availability service https://github.com/internetarchive/openlibrary/blob/master/openlibrary/core/lending.py#L378-L400
* [ ] @ximm and @mekarpeles coordinate to update the bulk availability API to pass along jurisdiction to ES

### Justification

Access to some items within the Internet Archive's purview are geographically restricted.

Currently, this only affects a few hundred Open Library records:
https://archive.org/advancedsearch.php?q=collection:geo_restricted%20AND%20openlibrary_edition:*&rows=10&output=json&fl=identifier,geo_restricted,collection&scope=all

### Breakdown

#### Related files

https://github.com/internetarchive/openlibrary/blob/master/openlibrary/core/lending.py#L378-L400

Relates to https://webarchive.jira.com/browse/WEBDEV-7187

#### Stakeholders

* @ximm @cdrini

Start with openlibrary/core/lending.py lines 378-400 and trace how the Availability request is assembled. Coordinate the nginx jurisdiction lookup and the bulk availability API handoff; the work is done when the three checklist items are complete and jurisdiction reaches ES with the requested client headers.

Written by the indexing model from the issue text.