Add standard Forwarded header support

[zitudu]

What this PR does / why we need it:

Add support of standard Forwarded defined by RFC 7239. Implement #10263

ConfigMap options:

	// Enable standard forwarded header.
	// Default: false
	EnableForwardedRFC7239 bool `json:"enable-forwarded-rfc7239"`

	// Sets if strips incoming Forwarded header.
	// Default: false
	ForwardedRFC7239StripIncomming bool `json:"forwarded-rfc7239-strip-incomming"`

	// Sets Forwarded parameters and their order. Available options are "for", "by", "host", "proto".
	// Default: "for"
	ForwardedRFC7239 []string `json:"forwarded-rfc7239"`

	// Sets Forwarded "for" parameter node identifier, should be "ip" or a static obfuscated string.
	// Default: "ip"
	ForwardedRFC7239For string `json:"forwarded-rfc7239-for,omitempty"`

	// Sets Forwarded "by" parameter node identifier, should be "ip" or a static obfuscated string.
	// Default: "ip"
	ForwardedRFC7239By string `json:"forwarded-rfc7239-by,omitempty"`

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] CVE Report (Scanner found CVE and adding report)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [ ] Documentation only

Which issue/s this PR fixes

How Has This Been Tested?

Checklist:

• [x] My change requires a change to the documentation.
• [x] I have updated the documentation accordingly.
• [x] I've read the CONTRIBUTION guide
• [x] I have added unit and/or e2e tests to cover my changes.
• [x] All new and existing tests passed.

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[zitudu]

hi, @strongjz @cpanato @puerco. It is ready for review. I'm looking forward to your suggestions to make this implementation better。

[rikatz]

/assign

[k8s-ci-robot]

PR needs rebase.

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