[INTERNAL] readers: Remove Transformer

We currently have no use case for this reader

Author: RandomByte

lib/AbstractReader.js

@@ -99,22 +99,6 @@ class AbstractReader {
 		});
 	}
 
-	/**
-	 * Create a [Transformer-Reader]{@link @ui5/fs/readers/Transformer} from the current reader.
-	 *
-	 * @private
-	 * @param {@ui5/fs/readers/Transformer~callback} callback
-	 * 				Callback to check and eventually transform any resource passed through the reader
-	 * @returns {Promise<@ui5/fs/readers/Transformer>} Promise resolving with transformer instance
-	 */
-	async transform(callback) {
-		const {default: Transformer} = await import("./readers/Transformer.js");
-		return new Transformer({
-			reader: this,
-			callback
-		});
-	}
-
 	/**
 	 * Create a [Link-Reader]{@link @ui5/fs/readers/Link} where all requests are prefixed with
 	 * <code>/resources/<namespace></code>.

lib/readers/Transformer.js

@@ -87,30 +87,6 @@ test("Filter resources", async (t) => {
 	t.is(resources[0].getPath(), "/app/test.js", "Found correct resource");
 });
 
-test("Transform resources", async (t) => {
-	const source = createAdapter({
-		fsBasePath: "./test/fixtures/application.a/webapp",
-		virBasePath: "/app/"
-	});
-	const transformedSource = await source.transform(async (resourcePath, getResource) => {
-		if (resourcePath === "/app/test.js") {
-			const resource = await getResource();
-			resource.setPath("/app/transformed-test.js");
-		}
-	});
-
-	const resources = await transformedSource.byGlob("**/*.js");
-	t.is(resources.length, 1, "Found one resource via transformer");
-	t.is(resources[0].getPath(), "/app/transformed-test.js", "Found correct resource");
-
-	const sourceResources = await source.byGlob("**/*.js");
-	t.is(sourceResources.length, 1, "Found one resource via source");
-	t.is(sourceResources[0].getPath(), "/app/test.js", "Found resource with original path");
-
-	t.is(await resources[0].getString(), await sourceResources[0].getString(),
-		"Resources have identical content");
-});
-
 test("Flatten resources", async (t) => {
 	const source = createAdapter({
 		fsBasePath: "./test/fixtures/application.a/webapp",