perf: add support for perfetto performance tracing (#17591)

Add a new build option enabling support for Perfetto SDK which can be used to trace Envoy code paths.

Risk Level: low
Testing: manual
Docs Changes: add notes to bazel/PPROF.md
Release Notes: updated current.rst
Platform Specific Features: n/a
Fixes #16988

Signed-off-by: Dmitry Rozhkov <dmitry.rozhkov@intel.com>

Mirrored from https://github.com/envoyproxy/envoy @ 4c76813087c07171996d2cd8a9c591604b9124d8

envoy/config/bootstrap/v3/bootstrap.proto

@@ -41,7 +41,7 @@ option (udpa.annotations.file_status).package_version_status = ACTIVE;
 // <config_overview_bootstrap>` for more detail.
 
 // Bootstrap :ref:`configuration overview <config_overview_bootstrap>`.
-// [#next-free-field: 33]
+// [#next-free-field: 34]
 message Bootstrap {
   option (udpa.annotations.versioning).previous_message_type =
       "envoy.config.bootstrap.v2.Bootstrap";
@@ -326,6 +326,10 @@ message Bootstrap {
   //
   // Note that the 'set-cookie' header cannot be registered as inline header.
   repeated CustomInlineHeader inline_headers = 32;
+
+  // Optional path to a file with performance tracing data created by "Perfetto" SDK in binary
+  // ProtoBuf format. The default value is "envoy.pftrace".
+  string perf_tracing_file_path = 33;
 }
 
 // Administration interface :ref:`operations documentation