Use libsignal-client for parsing crash reports

protos/CrashReports.proto

@@ -1,15 +0,0 @@
-syntax = "proto3";
-
-// Copyright 2020 Signal Messenger, LLC
-// SPDX-License-Identifier: AGPL-3.0-only
-
-package signalservice;
-
-message CrashReport {
-  string filename = 1;
-  bytes content = 2;
-}
-
-message CrashReportList {
-  repeated CrashReport reports = 1;
-}