Remove unwanted POST/PUT/PATCH shortcut methods. (#490)

## What changes are proposed in this pull request?

Remove unwanted POST/PUT/PATCH shortcut methods. These methods did not
accept request bodies, making it impossible to specify which fields to
update or create. These methods are also bug-prone, as an empty body
might mean unsetting all the empty fields.

## How is this tested?

Existing CI.

---------

Co-authored-by: Renaud Hartert <[email protected]>

Author: parthban-db

NEXT_CHANGELOG.md

@@ -5,6 +5,10 @@
 ### New Features and Improvements
 
 ### Bug Fixes
+- [BREAKING] Removed shortcut methods for POST/PUT/PATCH operations.
+These methods did not accept request bodies, making it impossible to 
+specify which fields to update or create. If you depend on these methods, 
+use the corresponding methods that accept full request objects instead. 
 
 ### Documentation