Add codespell support (config, workflow to detect/not fix) and make i…

…t fix some typos (#166)

* Add github action to codespell main on push and PRs

* Add rudimentary codespell config

* Add pre-commit definition for codespell

* [DATALAD RUNCMD] chore: run codespell throughout fixing a few typos interactively

=== Do not change lines below ===
{
 "chain": [],
 "cmd": "codespell -w -i 3 -C 4",
 "exit": 0,
 "extra_inputs": [],
 "inputs": [],
 "outputs": [],
 "pwd": "."
}
^^^ Do not change lines above ^^^

* [DATALAD RUNCMD] Download codespell ignore words from nilearn

=== Do not change lines below ===
{
 "chain": [],
 "cmd": "wget https://raw.githubusercontent.com/nilearn/nilearn/refs/heads/main/.github/codespell_ignore_words.txt",
 "exit": 0,
 "extra_inputs": [],
 "inputs": [],
 "outputs": [],
 "pwd": ".github"
}
^^^ Do not change lines above ^^^

* Per authors request -- (re)use list of words from nilearn

* [DATALAD RUNCMD] chore: run codespell throughout fixing a few  new typos automagically

=== Do not change lines below ===
{
 "chain": [],
 "cmd": "codespell -w",
 "exit": 0,
 "extra_inputs": [],
 "inputs": [],
 "outputs": [],
 "pwd": "."
}
^^^ Do not change lines above ^^^

tag for 2024 release

tag for release accompanying benchmark

tag for initial release