GitLab

* Check .ino sketch file exists in path before creating a new one

Running "arduino-cli sketch new ." from a sketch directory overwrites an existing .ino sketch file, without asking for confirmation. This fix introduces a check to verify if the specified path already
contains a .ino sketch file. If it does, an error is returned, otherwise a new sketch is created as usual.

* Add test to check if sketch new does not overwrite an already existing .ino sketch file

* Add --overwrite flag to sketch new command

Using the "--overwrite" flag, allows to create a new sketch overwriting an existing one.