Validate request body

[niwsa]

What does this PR do?

Throughout the application, when a body is accepted through a POST request, the request body is cast to the correct type, with the parameters usually being strings. But, Typescript does not perform any checks at runtime, allowing more complex types (arrays and objects) to be passed in. This can potentially lead to unexpected behavior. For example, some functions allow passing either a string or an object with options as the first argument.

Add validation to request body to fix above issue.

Type of change

• Updated dependencies
• 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

How should this be tested?

• Existing unit tests

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code and corrected any misspellings
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes