feat: start dotnet detection (#955)

* feat: start dotnet detection

* Apply suggestions from code review

Co-authored-by: Willi Ballenthin <willi.ballenthin@gmail.com>

* refactor: dn instead of dotnet

* refactor: format branches, extractor reorg

* refactor: format selection and dotnet detect

* feat: get format, arch, os

* refactor: log errors and exceptions

* ci: also test and build for dotnet-main dev

* fix: import path

* fix: circular dep

* fix: remove buf argument
feat: get runtime meta data

* fix: log unsupported runtime error

* fix: type ignore

Co-authored-by: Willi Ballenthin <willi.ballenthin@gmail.com>

setup.py

@@ -26,6 +26,7 @@ requirements = [
     "smda==1.7.1",
     "pefile==2021.9.3",
     "pyelftools==0.28",
+    "dnfile==0.10.0",
 ]
 
 # this sets __version__