Trylle

Correctly capture request body for fasthttp and fiber by @giortzisg in #1284

(http) Avoid async transport shutdown panics by @giortzisg in #1288

(httpclient) Clone request before adding trace headers by @giortzisg in #1290

(scope) Use scoped client for request PII by @giortzisg in #1289

Safe concurrent access for span and scope by @giortzisg in #1285