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* (feat)usbmsc: Add is_writable function

Add is_writable function to the USBMSC class.
Allows USBMSC to be mounted in read-only mode.

* Update USBMSC.ino

Changes to USB Mass Storage (MSC) example code in Arduino USB library

* Added MSC.isWritable(true) line to set the disk as writable

* ci(pre-commit): Apply automatic fixes

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Co-authored-by: Rodrigo Garcia <rodrigo.garcia@espressif.com>
Co-authored-by: pre-commit-ci-lite[bot] <117423508+pre-commit-ci-lite[bot]@users.noreply.github.com>