feat: added TemplateMemory

Author: JS-AK

src/lib/template/index.ts

@@ -1 +1,2 @@
 export * from "./template-fs.js";
+export * from "./template-memory.js";

src/lib/template/memory-write-stream.ts

@@ -0,0 +1,16 @@
+export class MemoryWriteStream {
+	private chunks: Buffer[] = [];
+
+	write(chunk: string | Buffer): boolean {
+		this.chunks.push(Buffer.isBuffer(chunk) ? chunk : Buffer.from(chunk, "utf-8"));
+		return true;
+	}
+
+	end(): void {
+		// no-op
+	}
+
+	toBuffer(): Buffer {
+		return Buffer.concat(this.chunks);
+	}
+}