Enable @script type detection with shebang line

[sagiegurari]

Features Description
The shebang support points to an existing executable to run the script.
Might be really useful also to support the @script types such as @duckscript.
naturally langs that do not support the # comments will not work well.

Code Sample

[tasks.duckscript-example]
script = [
'''
#!@duckscript
echo hello from duckscript
'''
]