Allow sizeLimit to be passed to mergeFromBuffer so it can be passed t… #1308

Job	Run time
format_analyze; linux; Dart dev; PKG: benchmarks; `dart format --output=none --set-exit-if-change...	17s
format_analyze; linux; Dart dev; PKG: api_benchmark; `dart format --output=none --set-exit-if-cha...	33s
mono_repo self validate	19s
format_analyze; linux; Dart 2.19.0; PKG: protobuf; `dart analyze lib`, `dart analyze test`	22s
format_analyze; linux; Dart dev; PKG: protobuf; `dart format --output=none --set-exit-if-changed ...	18s
format_analyze; linux; Dart dev; PKG: protoc_plugin; `dart format --output=none --set-exit-if-cha...	21s
run_tests; linux; Dart dev; PKG: protobuf; `dart test`	0s
run_tests; linux; Dart 2.19.0; PKG: protoc_plugin; `./../tool/setup.sh`, `make protos`, `dart test`	0s
run_tests; linux; Dart 2.19.0; PKG: protobuf; `dart test`	0s
run_tests; osx; Dart 2.19.0; PKG: protobuf; `dart test`	0s
run_tests; linux; Dart dev; PKG: protoc_plugin; `./../tool/setup.sh`, `make protos`, `dart test`	0s
run_tests; osx; Dart dev; PKG: protobuf; `dart test`	0s
run_tests; windows; Dart dev; PKG: protobuf; `dart test`	0s
run_tests; windows; Dart 2.19.0; PKG: protobuf; `dart test`	0s
run_legacy_tests; linux; Dart 2.19.0; PKG: protoc_plugin; `./../tool/setup.sh`, `make protos`, `d...	0s
	2m 10s

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