Add CryptController for password hashing functionality

Introduces a new `CryptController` in the `DigitalData.Auth.API.Controllers` namespace. This API controller features a GET endpoint, `Hash`, which accepts a password as a query parameter and returns its BCrypt hashed version.

src/DigitalData.Auth.API/Controllers/CryptController.cs

@@ -0,0 +1,11 @@
+using Microsoft.AspNetCore.Mvc;
+
+namespace DigitalData.Auth.API.Controllers;
+
+[Route("api/[controller]")]
+[ApiController]
+public class CryptController : ControllerBase
+{
+    [HttpGet]
+    public IActionResult Hash([FromQuery] string password) => Ok(BCrypt.Net.BCrypt.HashPassword(password));
+}