lint: enable Ruff's D ~ pydocstyle

[Borda]

complementary but still independent addition to #220
Note that the docs still needed to be checked so we could start with some ignored rules marked for todo and ask the community to help fix them...

[Borda]

remaining issues to be resolved:

cachier/__init__.py:1:1: D104 Missing docstring in public package
cachier/__main__.py:10:5: D401 First line of docstring should be in imperative mood: "A command-line interface for cachier."
cachier/config.py:1:1: D100 Missing docstring in public module
cachier/config.py:19:7: D101 Missing docstring in public class
cachier/core.py:108:5: D417 Missing argument description in the docstring for `cachier`: `hash_params`
cachier/core.py:121:5: D401 First line of docstring should be in imperative mood: "A persistent, stale-free memoization decorator."
cachier/core.py:304:13: D417 Missing argument descriptions in the docstring for `_precache_value`: `**kwds`, `*args`
cachier/cores/__init__.py:1:1: D104 Missing docstring in public package
cachier/cores/base.py:18:7: D101 Missing docstring in public class
cachier/cores/base.py:99:9: D205 1 blank line required between summary line and description
cachier/cores/pickle.py:65:13: D401 First line of docstring should be in imperative mood: "A Watchdog Event Handler method."
cachier/cores/pickle.py:69:13: D401 First line of docstring should be in imperative mood: "A Watchdog Event Handler method

[Borda]

@shaypal5 seems to be ready for landing...