Remove all the lib/inputhook logic and related files.

1) for terminal ipython hooks are in pt_inputhook,
2) for ipykernel the inputhook are in ipykernel itself.

codecov.yml

@@ -17,7 +17,6 b' ignore:'
   - IPython/kernel/*
   - IPython/consoleapp.py
   - IPython/core/inputsplitter.py
-  - IPython/lib/inputhook*.py
   - IPython/lib/kernel.py
   - IPython/utils/jsonutil.py
   - IPython/utils/localinterfaces.py

pytest.ini

@@ -36,7 +36,6 b' addopts = --durations=10'
     --ignore=IPython/kernel
     --ignore=IPython/consoleapp.py
     --ignore=IPython/core/inputsplitter.py
-    --ignore-glob=IPython/lib/inputhook*.py
     --ignore=IPython/lib/kernel.py
     --ignore=IPython/utils/jsonutil.py
     --ignore=IPython/utils/localinterfaces.py