feat: expose HTTP response log methods on MonitorService
Re-export new types and enums (HTTPResponseLogTiming, HTTPResponseLogListItem,
HTTPResponseLogDetail, HTTPResponseLogPagination, ListMonitorHTTPResponseLogs
request/response, GetMonitorHTTPResponseLog request/response,
HTTPResponseLogRequestStatus, HTTPResponseLogTrigger) and document the new
listMonitorHTTPResponseLogs and getMonitorHTTPResponseLog methods in README and
docs/monitor-service.md.