Bonus Stuff - server-side validations

[Hannah0701]

User Story

As an Admin, I want all Add and Edit item requests to have server-side validations

Implementation Details

No server side validation necessary for the GET and DELETE functions/methods Added server side validations to POST and PUT requests to check input values valid:

• name = not empty including not empty with just whitespace
• description = not empty including not empty with just whitespace
• category = not empty including not empty with just whitespace
• price = Integer (which automatically means not empty)
• image = custom check that file input ends in one of .jpg, .jpeg, .png, .gif, .svg

Updated status codes

[Hannah0701]

https://github.com/multiverse-team-11/inventory-app/commit/614311a31bc416e752e68b69090748d73ff3ae26 accidentally forgot to make a branch and committed directly into the main branch (should probably establish branch protection to prevent this)