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perf(gql_http_link): improve json decoder performance #929

Job	Run time
Check end_to_end_test	59s
Check gql	37s
publish_dry_run	20s
Check end_to_end_test_tristate	57s
Check gql_example_cli	49s
Check gql_exec	32s
Check gql_example_cli_github	58s
Check gql_code_builder_serializers	28s
Check gql_example_build	50s
Check gql_build	34s
Check gql_example_http_auth_link	28s
Check gql_code_builder	50s
Check gql_example_dio_link	25s
Check gql_link	30s
Check gql_dedupe_link	33s
Check gql_dio_link	51s
Check gql_error_link	35s
Check gql_http_link	53s
Check gql_websocket_link	1m 13s
Check gql_transform_link	35s
Check gql_tristate_value	37s
	14m 34s

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