Add pip check to CI workflows

[pvk-developer]

The current CI workflows and local test and lint commands do not catch dependency incompatibilities.

For example, installing the repository for development on the master branch results in these errors:

ERROR: packaging 21.2 has requirement pyparsing<3,>=2.0.2, but you'll have pyparsing 3.0.4 which is incompatible.
ERROR: deepecho 0.2.1 has requirement torch<1.8,>=1.4, but you'll have torch 1.10.0 which is incompatible.
ERROR: numba 0.54.1 has requirement numpy<1.21,>=1.17, but you'll have numpy 1.21.3 which is incompatible.
ERROR: autopep8 1.6.0 has requirement pycodestyle>=2.8.0, but you'll have pycodestyle 2.7.0 which is incompatible.

A pip check command should be made part of the local and CI tests to make sure that our dependency tree is always clean.