Add upstream HTTP filter support to http-filter-cc example - #1052

Add upstream HTTP filter support to http-filter-cc example#1052

phlax with Copilot wants to merge 2 commits into

copilot/enhance-http-filter-cc-exampleenvoyproxy/examples:copilot/enhance-http-filter-cc-examplefrom

copilot/fix-factory-cc-registrationenvoyproxy/examples:copilot/fix-factory-cc-registrationCopy head branch name to clipboard