JS: Add typedocs for all extra modules

applications/system/js_app/packages/fz-sdk/usbdisk/index.d.ts

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+/**
+ * Module for USB mass storage emulation
+ * @version Available with JS feature `usbdisk`
+ * @module
+ */
+
+/**
+ * @brief Create a disk image and format it as FatFs, error on failure
+ * @param path Where to create the disk image
+ * @param size How big the disk image should be
+ * @version Available with JS feature `usbdisk-createimage`
+ */
+export declare function createImage(path: string, size: number): void;
+
+/**
+ * @brief Start emulating mass storage device
+ * @param path The disk image to emulate
+ */
+export declare function start(path: string): void;
+
+/**
+ * @brief Stop emulating mass storage device
+ */
+export declare function stop(): void;
+
+/**
+ * @brief Check if the mass storage device was exected
+ * 
+ * Useful as a loop condition with a delay, so UsbDisk keeps running until ejected
+ * 
+ */
+export declare function wasEjected(): boolean;