Add configurable option to ignore valid import check

[SferaDev]

Markdown comments won't necessarily have a well-formed import expression, add an escape hatch for eslint configuration to ignore the valid import check.

Before merge, the readme for the rule should be updated to document this new flag.

[changeset-bot]

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Latest commit: 0a649eb

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[colebemis]

Great minds think alike! I implemented a similar option in this PR: #7

[SferaDev]

Cool! Superseded by #7.

Closing as yours has proper eslint rule schema, tests and the readme updated.