feat: Add `logIframeErrors` option to not print iframe error to console

[straker]

This uses the same option name as axe-cli with the idea being that it can just pass the option directly into this. The default is true so behavior doesn't change from before, and only passing stdout: false will cause it to throw the error.

Closes: #41

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[straker]

@stephenmathieson I can see what you mean. The option was suppose to mimic the axe-cli --stdout flag, which is a boolean. I was going for consistency in API names since axe-cli uses axe-webdriver. What do you think of printToStdout or maybe verbose?

[stephenmathieson]

Maybe something like logIframeErrors: true | false? This way it clearly states its purpose.

[padmavemulapati]

Dev Task.

[stephenmathieson]

@padmavemulapati there is something "QA-able" here. One could verify the behavior with/without the logIframeErrors option provided.