Add support for directly RW to normal file

[DynamicLoader]

As described in the title, I've add support to directly read & write to a normal file. This could cancel the restriction on mounting and formatting can only work on a loop device.

The main modification is to judge the type and use stat series syscall when the file is a normal file.

Tested on Ubuntu 22.04.

[geky]

Hi @DynamicLoader, thanks for creating a PR.

I think this is a good idea to adopt eventually, but sorry if it takes some time to merge. This is just low priority at the moment.

It may also be useful to combine with #70 (make block size required) to solve the unknown block size issue.

[ldenefle]

I'm actually quite interested by this feature too.

The reason for that is that we want to build littlefs images dynamically for various test scenarios and docker does not allow us to use loop devices in the CI as they require kernel modules (loop).
So the possibility to do everything in usermode without requiring kernel modules is super interesting.

[DynamicLoader]

It had been too long to merge this so I'd recommend to build it yourself if possible.

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