[DE-584] Refactor Deprecated /_api/simple methods (#275)

* initial commit

* Update CHANGELOG.md

* fix: validate index type on `find_in_box`

* fix: black

* cleanup: get_index

* address `find_in_box` improvements

* new: test case for no index provided

* add pragma no cover

adding a geo index only allows 1 or 2 fields, so this case will not happen (unless this changes in the future)

* fix: auto-gen collection name

Author: aMahanna

CHANGELOG.md

@@ -2,6 +2,7 @@ main
 -----
 
 * [DE-542] Added `shards()` method to `Collection`
+* [DE-584] Refactor deprecated `/_api/simple` methods
 
 7.6.0
 -----