[4/n] refactor, add RequestEndpointMetadata#1174

sunshowers merged 6 commits intomainoxidecomputer/dropshot:mainfrom

sunshowers/spr/4n-refactor-add-requestendpointmetadataoxidecomputer/dropshot:sunshowers/spr/4n-refactor-add-requestendpointmetadataCopy head branch name to clipboard