POLIO-1687 Adding caching after failing hotfix

[mathvdh]

Adding caching on the endpoint so that PowerBI is not overloading it. ⚠️ This has been released as a hotfix on polio prod.

Related JIRA tickets : POLIO-1687

Self proofreading checklist

• [x] Did I use eslint and black formatters
• [x] Is my code clear enough and well documented

Changes

Simple django cache on list endpoint