* add random suffix mode
* fix linter issues
* add test case
* fix linter issues
* add comments, remove empty lines and single line declarations
* more test cases
* refactor(config): rename suffix_mode to random_suffix
* refactor(paste): clean up the random suffix logic
* chore(config): add random suffix example to default config
* docs(readme): mention random suffix feature
* test(fixtures): add fixture test for random suffix mode
* random_suffix -> suffix_mode
* fix default extension for .dotfile w/o extension
* fix formatting
* style(format): fix the indentation for random suffix fixture
---------
Co-authored-by: Orhun Parmaksız <orhunparmaksiz@gmail.com>