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add: support for `nickel format` as `Nickel` fixer #1814

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Run time

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Job	Run time
build_image	9s
test_ale (--vim-80-only)	1m 43s
test_ale (--vim-90-only)	2m 12s
test_ale (--neovim-06-only)	1m 26s
test_ale (--neovim-08-only)	1m 36s
test_ale (--linters-only)	31s
	7m 37s