Add backend and compat to pylint checks

Author: marvinpfoertner

tox.ini

@@ -71,6 +71,8 @@ commands =
     # Global Linting Pass
     pylint src/probnum --disable="no-member,abstract-method,arguments-differ,arguments-renamed,function-redefined,redefined-builtin,redefined-outer-name,too-many-instance-attributes,too-many-arguments,too-many-locals,too-many-lines,too-many-statements,too-many-branches,too-complex,too-few-public-methods,protected-access,unnecessary-pass,unused-variable,unused-argument,attribute-defined-outside-init,no-else-return,no-else-raise,no-self-use,else-if-used,consider-using-from-import,duplicate-code,line-too-long,missing-module-docstring,missing-class-docstring,missing-function-docstring,missing-param-doc,missing-type-doc,missing-raises-doc,useless-param-doc,useless-type-doc,missing-return-doc,missing-return-type-doc" --jobs=0
     # Per-package Linting Passes
+    pylint src/probnum/backend --jobs=0
+    pylint src/probnum/compat --jobs=0
     pylint src/probnum/diffeq --disable="redefined-outer-name,too-many-instance-attributes,too-many-arguments,too-many-locals,too-few-public-methods,protected-access,unnecessary-pass,unused-variable,unused-argument,no-else-return,no-else-raise,no-self-use,duplicate-code,line-too-long,missing-function-docstring,missing-param-doc,missing-type-doc,missing-raises-doc,missing-return-doc,missing-return-type-doc" --jobs=0
     pylint src/probnum/filtsmooth --disable="no-member,arguments-differ,arguments-renamed,too-many-arguments,too-many-locals,too-few-public-methods,protected-access,unused-variable,unused-argument,no-else-return,no-self-use,duplicate-code,line-too-long,missing-module-docstring,missing-class-docstring,missing-function-docstring,missing-param-doc,missing-type-doc,missing-raises-doc,useless-param-doc,useless-type-doc,missing-return-doc,missing-return-type-doc" --jobs=0
     pylint src/probnum/linalg --disable="no-member,abstract-method,arguments-differ,redefined-builtin,too-many-instance-attributes,too-many-arguments,too-many-locals,too-many-lines,too-many-statements,too-many-branches,too-complex,too-few-public-methods,protected-access,unused-argument,attribute-defined-outside-init,no-else-return,no-else-raise,no-self-use,else-if-used,duplicate-code,line-too-long,missing-module-docstring,missing-param-doc,missing-type-doc,missing-raises-doc,missing-return-doc,missing-return-type-doc" --jobs=0