Added Support for Debian Packages.

[35C4n0r]

Added package registry support for Debian. Closes #49

Changes:

1. src/fetchcode/init.py: The Response Class has a new success parameter, which will be true if and only if the status code is 200, false otherwise.
2. src/fetchcode/ls.py: New file picked from minecode https://github.com/nexB/purldb/blob/main/minecode/ls.py, helps with parsing ls-lR data.
3. src/fetchcode/package.py: Few functions have been moved to src/fetchcode/utils.py. Added support for Debian Packages.
4. Added new tests.

Signed-off-by: Jay jaykumar20march@gmail.com

[35C4n0r]

@pombredanne debian-inspector==30.0.0 is already there in requirments.txt https://github.com/nexB/fetchcode/blob/master/requirements.txt#L16
But still getting a ModuleNotFoundError
https://dev.azure.com/nexB/fetchcode/_build/results?buildId=9535&view=logs&j=507fa362-3884-541e-67f1-7f9dec95b9e1&t=b4c3d56a-151e-51cc-2876-474e83122372&l=273

[AyanSinhaMahapatra]

@35C4n0r I think you have to add it to https://github.com/nexB/fetchcode/blob/master/setup.cfg#L53 if you're importing it, this is what's used when installing. Requirements is only used for constraints https://github.com/nexB/fetchcode/blob/master/configure#L31

[35C4n0r]

@AyanSinhaMahapatra any idea why the checks are not running for 33e78dc ?