Create volunteer signup request model (Vaaranan/Yaser)

[vaaranan-y]

Notion ticket link

Create a volunteer signup request model

Implementation description

• Created a model for the VolunteerSignUp entity, by creating an entry in the prisma schema, and its own TypeScript model
• Added a new type to set the status of a VolunteerSignUp entity

Steps to test

1. Likely cannot be black-box tested (just a model) but model can be verified to match up with Figma design (https://www.figma.com/file/99N86wIdlsQuQ2Jat9kv0k/ABTC-Architecture-Design?type=whiteboard&node-id=1-34&t=GE7nuttz58QlLy4P-0) and checking parameters for model in backend/typescript/models/volunteerSignUp.model.ts and backend/typescript/prisma/schema.prisma match up appropriately

What should reviewers focus on?

• We probably want to make sure that the attributes of our model are correctly defined, and if there is anything we are missing (i.e. first name, last name, etc.)

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

[anmoltyagi1]

Looks good to go, small thing - can you take out this v - we don't need it.

[vaaranan-y]

Done!