feat(translator): implement httproutefilter host rewrite

[guydc]

What type of PR is this?

What this PR does / why we need it:

• Updates API to format requested in #4410
• Implements host rewrite based on custom header and backend dns name
• E2E and docs
• Fix Regex Path rewrite docs and translation bug

Which issue(s) this PR fixes:

Fixes #3173, #4410