Support for results cache file

[j13k]

Description

Store linted filenames and signatures in a .gitignoreable results cache file, to allow unchanged files to be skipped.

Example

Cache filename: .yaml-lint-results-cache

Cache file contents:

/home/j13k/tests/test1.yml 9f57cb6838d2e1f2d0e0d9b1dacc36abe1946c61

[stale]

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