Convert String args to &str

[ericapywang]

Problem

Currently, we are not being consistent with how we pass strings into functions. Control plane takes in a &str while data plane takes in a String.

Solution

I updated all endpoints to take in a &str instead of a String. This allows for the user to determine the lifetime of string variables that they pass in.

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update
• Infrastructure change (CI configs, etc)
• Non-code change (docs, etc)
• None of the above: (explain here)

Test Plan

Test cases should pass