[request] add support for LittleFS (and maybe other flash based filesystems)

[atesin]

hi... Lua can be installed on embedded devices with NO operating system

many of these embedded devices have internal flash memories with a filesystem inside, often with LittleFS, SPIFFS, FAT or another similar ... for example an arduino with SD card shield, an ESP8266/32, a Raspberry Pi pico, a network router, a tv-box, or whatever other similar device .. there are actually many appliances that inlcude lua by default like OpenWRT

i am trying to embed Lua in an esp8266 with LittleFS to load script files locally and do basic filesystem manipulation... like a retro PC with basic+msdos but with Lua+luafilesystem instead

i am using esp8266-arduino library that is compatible with the arduino API, here is the embedded LittleFS documentation for current release = https://arduino-esp8266.readthedocs.io/en/3.1.2/filesystem.html ... but i think the direct official LittleFS homepage is this = https://github.com/littlefs-project/littlefs

i am days pulling my hair trying to make luafilesystem work with with LittleFS but finally it exceeds my knowledge :( ... i am using this project as starting point for testings = https://github.com/sfranzyshen/ESP-Arduino-Lua

...

P.S.: SPIFFS is still popular, is simpler and faster than LittleFS... but is not fault tolerant, lacks features (i.e. directories), and is retired, more info here = https://arduino-esp8266.readthedocs.io/en/3.1.2/filesystem.html#spiffs-deprecation-warning