Add `perMethod`, `perHost`, `perPath` and builder to `RetryConfigMapping`#6243

schiemon wants to merge 4 commits intoline:mainline/armeria:mainfrom

schiemon:6242-retry-config-mapping-per-method-path-and-host-basisschiemon/armeria:6242-retry-config-mapping-per-method-path-and-host-basisCopy head branch name to clipboard