feat: update 2024 ClassSchema with primary_ability logic (#1066)

## What does this do?

Added the schema for 2024 classes to prepare for classes upload. This
only added a Primary Abilities Schema compared to 2014.

## How was it tested?

Matched against "correct" formatting

## Is there a Github issue this is resolving?

No

## Did you update the docs in the API? Please link an associated PR if
applicable.

No

## Here's a fun image for your troubles

My cat as a baby, please enjoy

![38260471_10216390722141710_3268489959299874816_n](https://github.com/user-attachments/assets/3b9d1dac-d1a9-4740-bf5f-13efc6a766d6)

Author: scarlettcsung

src/2024/schemas/5e-SRD-Classes.ts

@@ -0,0 +1,54 @@
+import { z } from 'zod';
+import { APIReferenceSchema, ChoiceSchema } from '../../schemas/common';
+
+const SpellcastingInfoSchema = z.object({
+  name: z.string(),
+  desc: z.array(z.string()),
+});
+
+const SpellcastingSchema = z.object({
+  level: z.number(),
+  spellcasting_ability: APIReferenceSchema,
+  info: z.array(SpellcastingInfoSchema),
+});
+
+const StartingEquipmentSchema = z.object({
+  equipment: APIReferenceSchema,
+  quantity: z.number(),
+});
+
+const MultiClassingPrereqSchema = z.object({
+  ability_score: APIReferenceSchema.optional(),
+  minimum_score: z.number(),
+});
+
+const MultiClassingSchema = z.object({
+  prerequisites: z.array(MultiClassingPrereqSchema).optional(),
+  prerequisite_options: ChoiceSchema.optional(),
+  proficiencies: z.array(APIReferenceSchema).optional(),
+  proficiency_choices: z.array(ChoiceSchema).optional(),
+});
+
+const PrimaryAbilitySchema = z.object({
+  desc: z.string(),
+  all_of: z.array(APIReferenceSchema).optional(),
+  any_of: ChoiceSchema.optional()
+});
+
+export const ClassSchema = z.object({
+  index: z.string(),
+  name: z.string(),
+  primary_ability: PrimaryAbilitySchema,
+  hit_die: z.number(),
+  class_levels: z.string(),
+  multi_classing: MultiClassingSchema.optional(),
+  proficiencies: z.array(APIReferenceSchema).optional(),
+  proficiency_choices: z.array(ChoiceSchema),
+  saving_throws: z.array(APIReferenceSchema).optional(),
+  starting_equipment: z.array(StartingEquipmentSchema).optional(),
+  starting_equipment_options: z.array(ChoiceSchema),
+  subclasses: z.array(APIReferenceSchema).optional(),
+  spellcasting: SpellcastingSchema.optional(),
+  spells: z.string().optional(),
+  url: z.string(),
+});