Rust

Add experimental "no-panic" feature. #2549

Job	Run time
bazel	5m 58s
msrv	3m 23s
nightly	58s
outdated	5m 25s
stable	1m 4s
licenses	15s
examples (http_auth_random)	33s
examples (hello_world)	23s
examples (envoy_filter_metadata)	55s
examples (grpc_auth_random)	14s
examples (http_body)	1m 13s
examples (http_config)	36s
examples (http_headers)	25s
reactors (http_headers)	23s
reactors (http_config)	27s
reactors (http_auth_random)	52s
reactors (http_body)	51s
reactors (envoy_filter_metadata)	22s
audit	2m 54s
reactors (grpc_auth_random)	22s
reactors (hello_world)	22s
	27m 55s

Provide feedback