Add support for executing scripts

[hohwille]

As a developer of IDEasy, I do not want to worry what I want to execute with ProcessContext so that like in bash, I can just run any executable command.
However, if the command is a bash script (e.g. catalina.sh for tomcat), then IMHO ProcessBuilder will not be able to run it directly.
If I am not mistaken the problem and solution is explained here:
https://www.baeldung.com/run-shell-command-in-java

We also need to implement a way how to determine if an executable is a (bash)script or not. My assumption would be:

• Filename is *.cmd or *.bat -> run using Windows CMD (only if OS is windows)
• Filename is *.sh or the first 2 bytes of the file content are #! -> run using Bash - on Windows we also have to find bash. If I just enter bash in a CMD shell, I get C:\Windows\System32\bash.exe that is not our Git-Bash but a very limited (and IMHO kind of buggy Bash implementation from Microsoft that is not working on my computer). So like we did in devonfw-ide, we might need to auto-detect and find where bit-bash is installed (most likely "C:\Program Files\Git\git-bash.exe" but we need a more generic way - see old bash scripts to see how it can be done). Further, we might not want to open a new Git-Bash window but run that inside our existing shell (that may be a git-bash, CMD, or PowerShell - all three standalone or inside Windows-Terminal).

[hohwille]

https://github.com/devonfw/ide/blob/master/scripts/src/main/resources/scripts/devon.bat#L38-L69

[hohwille]

Done with PR #86