Enable spellcheck for executable name

[edbighead]

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• I'd be willing to implement this feature (contributing guide)

Describe the user story
Sometimes users misspell atlantis word and are waiting for their PR to be planned or applied

Describe the solution you'd like
Add spellcheck using https://github.com/agext/levenshtein library (similar to terraform)

Describe the drawbacks of your solution
Might not play nice when there are different matching executable names, so perhaps hide it under a configuration flag.

Describe alternatives you've considered

• Use multiple executable names ATLANTIS_EXECUTABLE_NAME="atlantis,altantis,atantis". It's not supported though.
• Use run plan instead of the atlantis executable name
• Use @ and the bot user so it auto completes

[nitrocode]

Another workaround @edbighead , for now, is that instead of running atlantis plan and atlantis apply, you can use run plan and run apply which may reduce the chances of a typo.

@marcusramberg also mentioned in slack to use the @ and then the Atlantis bot user auto completes