Avoid allocating temporary views when decoding strings in `CodedBufferReader` #1196

Job	Run time
mono_repo self validate	21s
format_analyze; linux; Dart dev; PKG: benchmarks; `dart format --output=none --set-exit-if-change...	37s
format_analyze; linux; Dart dev; PKG: api_benchmark; `dart format --output=none --set-exit-if-cha...	44s
format_analyze; linux; Dart 2.19.0; PKG: protobuf; `dart analyze lib`, `dart analyze test`	29s
format_analyze; linux; Dart dev; PKG: protobuf; `dart format --output=none --set-exit-if-changed ...	28s
format_analyze; linux; Dart dev; PKG: protoc_plugin; `dart format --output=none --set-exit-if-cha...	43s
run_tests; linux; Dart 2.19.0; PKG: protobuf; `dart test`	44s
run_tests; linux; Dart dev; PKG: protobuf; `dart test`	46s
run_tests; linux; Dart 2.19.0; PKG: protoc_plugin; `./../tool/setup.sh`, `make protos`, `dart test`	1m 13s
run_tests; linux; Dart dev; PKG: protoc_plugin; `./../tool/setup.sh`, `make protos`, `dart test`	54s
run_tests; osx; Dart 2.19.0; PKG: protobuf; `dart test`	47s
run_tests; osx; Dart dev; PKG: protobuf; `dart test`	1m 18s
run_tests; windows; Dart 2.19.0; PKG: protobuf; `dart test`	58s
run_tests; windows; Dart dev; PKG: protobuf; `dart test`	1m 14s
run_legacy_tests; linux; Dart 2.19.0; PKG: protoc_plugin; `./../tool/setup.sh`, `make protos`, `d...	52s
	12m 8s

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