feat: add donor API clients

[hanlinc27]

Notion ticket link

Donor API Clients

Implementation description

• Added in FE clients for donor CRUD operations

Steps to test

1. Try calling any of the client functions on a FE page and log to see if successful

What should reviewers focus on?

• If all client functions work

Checklist

• My PR name is descriptive and in imperative tense
• My commit messages are descriptive and in imperative tense. My commits are atomic and trivial commits are squashed or fixup'd into non-trivial commits
• I have run the appropriate linter(s)
• I have requested a review from the PL, as well as other devs who have background knowledge on this PR or who will be building on top of this PR

[Shehryar21]

tested it out! Works for me!