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 ^^^

---------

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

pkg/common/git/git.go

@@ -126,7 +126,7 @@ func FindGitRef(ctx context.Context, file string) (string, error) {
 		 * it means we checked out a branch
 		 *
 		 * If a branches matches first we must continue and check all tags (all references)
-		 * in case we match with a tag later in the interation
+		 * in case we match with a tag later in the iteration
 		 */
 		if r.Hash().String() == ref {
 			if r.Name().IsTag() {