CI: Add specs and style checks

[effigies]

Summary

This PR should be reviewed commit-by-commit. The issues I was having previously were with mismatched versions of black installed in my dev environment and the precommit venv.

List of changes proposed in this PR (pull-request)

Acknowledgment

• (Mandatory) I acknowledge that this contribution will be available under the Apache 2 license.

[effigies]

The .git-blame-ignore-revs is useful for local blame, but TBH I mainly use blame via GitHub. Watching this thread in hopes that it gets built-in to GitHub.

[codecov]

Codecov Report

Merging #3321 (29e2760) into master (467183e) will not change coverage.
The diff coverage is 71.42%.

@@ Coverage Diff @@ ## master #3321 +/- ## ======================================= Coverage 65.00% 65.00% ======================================= Files 302 302 Lines 40027 40027 Branches 5292 5292 ======================================= Hits 26021 26021 Misses 12934 12934 Partials 1072 1072 

Flag	Coverage Δ
unittests	64.70% <71.42%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
nipype/algorithms/metrics.py	56.28% <ø> (ø)
nipype/algorithms/misc.py	45.24% <ø> (ø)
nipype/algorithms/modelgen.py	59.25% <ø> (ø)
nipype/algorithms/rapidart.py	34.42% <ø> (ø)
nipype/caching/memory.py	57.37% <ø> (ø)
nipype/info.py	87.50% <ø> (ø)
nipype/interfaces/ants/base.py	73.46% <ø> (ø)
nipype/interfaces/base/core.py	85.48% <ø> (ø)
nipype/interfaces/base/specs.py	89.28% <ø> (ø)
nipype/interfaces/base/support.py	79.53% <ø> (ø)
... and 112 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 467183e...29e2760. Read the comment docs.