Refactor DI for simplicity and type safety

This commit improves the dependency injection mechanism by introducing a
custom `injectKey` function.

Key improvements are:

- Enforced type consistency during dependency registration and
  instantiation.
- Simplified injection process, abstracting away the complexity with a
  uniform API, regardless of the dependency's lifetime.
- Eliminated the possibility of `undefined` returns during dependency
  injection, promoting fail-fast behavior.
- Removed the necessity for type casting to `symbol` for injection keys
  in unit tests by using existing types.
- Consalidated imports, combining keys and injection functions in one
  `import` statement.

tests/shared/Assertions/ExpectThrowsAsync.ts

@@ -0,0 +1,30 @@
+import { expect } from 'vitest';
+
+export async function expectThrowsAsync(
+  method: () => Promise<unknown>,
+  errorMessage: string,
+) {
+  let error: Error | undefined;
+  try {
+    await method();
+  } catch (err) {
+    error = err;
+  }
+  expect(error).toBeDefined();
+  expect(error).to.be.an(Error.name);
+  if (errorMessage) {
+    expect(error.message).to.equal(errorMessage);
+  }
+}
+
+export async function expectDoesNotThrowAsync(
+  method: () => Promise<unknown>,
+) {
+  let error: Error | undefined;
+  try {
+    await method();
+  } catch (err) {
+    error = err;
+  }
+  expect(error).toBeUndefined();
+}