Rust

Use RFC-compliant HeaderValue type. #2575

Job	Run time
bazel	5m 54s
outdated	5m 1s
audit	3m 14s
licenses	10s
msrv	2m 50s
nightly	1m 29s
examples (http_auth_random)	28s
examples (http_body)	30s
examples (grpc_auth_random)	24s
examples (http_headers)	32s
examples (hello_world)	25s
reactors (grpc_auth_random)	36s
reactors (hello_world)	23s
reactors (envoy_filter_metadata)	34s
reactors (http_headers)	27s
reactors (http_auth_random)	26s
stable	50s
examples (http_config)	21s
examples (envoy_filter_metadata)	1m 3s
reactors (http_body)	28s
reactors (http_config)	26s
	26m 31s

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