chore: add codespell support (config, workflow to detect/not fix) and make it fix some typos#30

yarikoptic wants to merge 4 commits intosimplefin:mastersimplefin/simplefin.github.com:masterfrom

yarikoptic:enh-codespellyarikoptic/simplefin.github.com:enh-codespellCopy head branch name to clipboard