[FEATURE REQUEST]FTP server

[luc-github]

Now have mature code for ESP8266 and ESP32 and 3.0 code is modular it could be good to add ftp server support
also FS could be easily splited at root
/FS/ for flash, /SD/ for SD, /USB/ for USB key and more if any

[luc-github]

I have added a global FS feature
Flash and SD are virtualy mounted as directories under /
[ESP780] and [ESP790] commands allow to navigate and doing some basic file management
[ESP780]

Directory on Global FS : /
<DIR> 	FS 	
<DIR> 	SD 	
0 file, 2 dir(s)

[ESP780]/FS

Directory on Global FS : /FS
      	index.html.gz 	6.58 KB 	
1 file, 0 dir
Total 169.38 KB, Used 6.86 KB, Available: 162.51 KB

[ESP780]/SD

Directory on Global FS : /SD
      	myfile.txt 	0 B 	
      	logo2.png 	3.28 KB 	
2 file(s), 0 dir
Total 14.71 GB, Used 64.00 KB, Available: 14.71 GB

When USB disk support will be added a /USB should be available also

[luc-github]

FTP server implementation is getting close ^_^

[luc-github]

ok feature completed

FTP transfer is 3X faster compare to web transfer and using Fatlib is 30% faster

on short transfer speed could change but on long transfer look a like

Web Transfert
SDFat lib
1124249 B  =  1.7MB in  21 sec
91327211 B = 87.1MB in  1716 sec = 28min 36s
Speed = 53.2KB/s

ESP32 core SD lib
1124249 B =  1.7MB in  37 sec
91327211 B = 87.1MB in  2265 sec = 37 min 45s
Speed = 40,3KB/s
 
 
FTP Transfert
SDFat lib
for 91327211 B
Transfer completed in 598710 ms, 152.539979 kbytes/s => 9min 58s
Transfer completed in 578694 ms, 157.816067 kbytes/s => 9min 39s 
 
 
for 1124249 B
Transfer completed in 7579 ms, 148.337380 kbytes/s => 7.6s
Transfer completed in 3821 ms, 294.228998 kbytes/s => 3.8s
Transfer completed in 5586 ms, 201.261905 kbytes/s => 6.6s

[github-actions]

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