Allow updating entire cocina at once via CLI

Why was this change made? 🤔

Fixes sul-dlss/dor-services-app#3733

This commit adds the ability to update an entire Cocina object at once, reading JSON from a given file path.

Includes:

Document new ability in README
Add description to cdl flag (missed in earlier commit)
Make SDR API job result parser aware of error conditions so it reports them to the user
Change cocina_item to cocina_object to be consistent w/ our Cocina naming convention
Raise an error when updating cocina if given an unreadable file or a non-existent file, or if given cocina with a different druid (external identifier) the the one supplied on the command-line