setup: install the analysis dependencies with the dev extra

pylint reports E0401 import-error for pandas, matplotlib and seaborn in
the analysis package, because the dev extra does not install them and CI
only installs ".[dev]". Add them to dev so lint can resolve the imports.

Also set long_description_content_type, so the README renders as
Markdown rather than plain text.

Extracted unmodified from PR kernelci#26 by Norbert Manthey.

Signed-off-by: Ben Copeland <ben.copeland@linaro.org>

Author: bhcopeland

setup.py

@@ -25,6 +25,7 @@
     version="1.0.0",
     description="Kernel-ci-cloud-labs",
     long_description=long_description,
+    long_description_content_type="text/markdown",
     package_dir={"": "src"},
     packages=find_packages(where="src"),
     python_requires=">=3.11",
@@ -45,6 +46,9 @@
             "isort>=5.0",
             "pre-commit>=2.0",
             "pytest-cov>=2.0",
+            "pandas>=1.3.0",
+            "matplotlib>=3.4.0",
+            "seaborn>=0.11.0",
         ],
         "analysis": [
             "pandas>=1.3.0",