feat(includeFiles): support {from, to} object form for custom serve paths

includeFiles now accepts string | {from, to} entries. The object form
allows specifying a custom serve path (e.g. ./html/index.html -> index.html)
for base64ts bundled content.

ts/mod_output/index.ts

@@ -22,6 +22,20 @@ export class Base64TsOutput {
     });
   }
 
+  /**
+   * Add a file with a custom serve path
+   */
+  public async addFileWithServePath(fromPath: string, servePath: string): Promise<void> {
+    const absolutePath = plugins.smartpath.transform.toAbsolute(fromPath, this.cwd) as string;
+    const fileExists = await plugins.fs.file(absolutePath).exists();
+    if (!fileExists) {
+      console.log(`File does not exist: ${absolutePath}`);
+      return;
+    }
+    const content = await plugins.fs.file(absolutePath).read();
+    this.addFile(servePath, content);
+  }
+
   /**
    * Add files matching a glob pattern
    */