Add codespell support (config, workflow to detect/not fix) and make it fix few typos (#2296)

* Add github action to codespell master on push and PRs

* Add codespell config with few custom skips

* [DATALAD RUNCMD] Do interactive fixing of  leftover ambigous typos

=== Do not change lines below ===
{
 "chain": [],
 "cmd": "codespell -w -i 3 -C 2 ./pkg/common/git/git.go",
 "exit": 0,
 "extra_inputs": [],
 "inputs": [],
 "outputs": [],
 "pwd": "."
}
^^^ Do not change lines above ^^^

* exclude pkg/runner/hashfiles/index.js

* [DATALAD RUNCMD] run codespell throughout fixing typos automagically

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

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Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

.codespellrc

@@ -0,0 +1,6 @@
+[codespell]
+# Ref: https://github.com/codespell-project/codespell#using-a-config-file
+skip = .git*,go.sum,package-lock.json,*.min.*,.codespellrc,testdata,./pkg/runner/hashfiles/index.js
+check-hidden = true
+ignore-regex = .*Te\{0\}st.*
+# ignore-words-list =