chore: add linters workflow

[erisu]

Platforms affected

n/a

Motivation and Context

Lint everything

Description

• Added clang linter for objective-c
• Added swiftlinter for swift
• Added markdownlint-cli2-action for markdown
• Added editorconfig-checker for general things.
• Applied lint fixes.

Testing

• n/a

Checklist

• I've run the tests to see all new and existing tests pass
• I added automated test coverage as appropriate for this change
• Commit is prefixed with (platform) if this change only applies to one platform (e.g. (android))
• If this Pull Request resolves an issue, I linked to the issue in the text above (and used the correct keyword to close issues using keywords)
• I've updated the documentation if necessary

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.21%. Comparing base (204b85e) to head (6861a4f).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1604   +/-   ##
=======================================
  Coverage   80.21%   80.21%           
=======================================
  Files          18       18           
  Lines        5312     5312           
=======================================
  Hits         4261     4261           
  Misses       1051     1051           

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