Add a run wrapper for windows

[jkroepke]

Add a shell wrapper for windows.

Try to find a bash in different way:

• If HELM_SECRETS_WINDOWS_SHELL is defined (path to a shell or wsl provided by user), use it.
• Lookup for a sh binary in path
• Lookup defauft installation path of Git for Windows
• Search git.exe (aside from default installations) and use the bash avaible inside
• Use wsl, if installed.
• Errored if all tries above failed.

[github-actions]

sh-checker report

shellcheck output

In scripts/run.sh line 84:
if [ "$(basename "$1")" == "run.sh" ]; then
                        ^-- SC2039: In POSIX sh, == in place of = is undefined.

For more information:
  https://www.shellcheck.net/wiki/SC2039 -- In POSIX sh, == in place of = is ...

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