feat: add form for submitting testimonials (#3)

### Explanation

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### Issue

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### Attestations

- [x] I have read and agree to the [Code of Conduct](https://docs.nhcarrigan.com/community/coc/)
- [x] I have read and agree to the [Community Guidelines](https://docs.nhcarrigan.com/community/guide/).
- [x] My contribution complies with the [Contributor Covenant](https://docs.nhcarrigan.com/dev/covenant/).

### Dependencies

- [ ] I have pinned the dependencies to a specific patch version.

### Style

- [x] I have run the linter and resolved any errors.
- [x] My pull request uses an appropriate title, matching the conventional commit standards.
- [x] My scope of feat/fix/chore/etc. correctly matches the nature of changes in my pull request.

### Tests

- [ ] My contribution adds new code, and I have added tests to cover it.
- [ ] My contribution modifies existing code, and I have updated the tests to reflect these changes.
- [ ] All new and existing tests pass locally with my changes.
- [ ] Code coverage remains at or above the configured threshold.

### Documentation

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### Versioning

Minor - My pull request introduces a new non-breaking feature.

Reviewed-on: nhcarrigan/forms#3
Co-authored-by: Naomi Carrigan <commits@nhcarrigan.com>
Co-committed-by: Naomi Carrigan <commits@nhcarrigan.com>

packages/types/src/forms/testimonial.ts

@@ -0,0 +1,13 @@
+/**
+ * @copyright nhcarrigan
+ * @license Naomi's Public License
+ * @author Naomi Carrigan
+ */
+
+export interface Testimonial {
+  consent:   boolean;
+  content:   string;
+  email:     string;
+  firstName: string;
+  lastName:  string;
+}

packages/types/src/index.ts

@@ -11,6 +11,7 @@ import type { Event } from "./forms/event.js";
 import type { Meeting } from "./forms/meeting.js";
 import type { Mentorship } from "./forms/mentorship.js";
 import type { Staff } from "./forms/staff.js";
+import type { Testimonial } from "./forms/testimonial.js";
 import type { ReviewRequest } from "./requests/review.js";
 import type { DataResponse } from "./responses/data.js";
 import type { ErrorResponse } from "./responses/error.js";
@@ -28,4 +29,5 @@ export type {
   DataResponse,
   ErrorResponse,
   SuccessResponse,
+  Testimonial,
 };