Provides an option to output Contour's logs to a file

[Bryce-huang]

Please describe the problem you have [A clear, concise, description of the problem you are facing. What is the problem that feature X would solve for you?]

Currently, contour only supports printing logs to standard output。

log := logrus.StandardLogger()

So I hope that the contour log can be specified to the file directory through --contour-log-path

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[github-actions[bot]]

The Contour project currently lacks enough contributors to adequately respond to all Issues.

This bot triages Issues according to the following rules:

• After 60d of inactivity, lifecycle/stale is applied
• After 30d of inactivity since lifecycle/stale was applied, the Issue is closed

You can:

• Mark this Issue as fresh by commenting
• Close this Issue
• Offer to help out with triage

Please send feedback to the #contour channel in the Kubernetes Slack