[BUG] make sure span payload data are utf-8 safe string #7
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opentelemetry payload string must be utf-8 safe, related to issue Clarify that API users SHOULD use valid UTF-8 for exportable data #3421, otherwise grpc exporter will be failed with error message "traces export: rpc error: code = Internal desc = grpc: error while marshaling: string field contains invalid UTF-8"
payload in span Event must be converted to utf8 valid string with strings.ToValidUTF8 in both client and server.