opt: add decoder Option NoValidateJSON for skipping JSON faster

[AsterDY]

Background

By default, sonic uses FSM algorithm to skip unnecessary JSON parsing, but it's much slower than SIMD-fast-skipping. Thus we introduce an Option NoValidateJSON to boost cases such as :

• Mismatched-type values
• Unknown fields
• Omitted fields
• Empty struct
• Redundant array elements
• json.Unmarshaler (json.RawMessage)

Performance

In x86, the fast-skipping is 5x times fast when handling complicated JSON value like TwitterJSON

goos: linux
goarch: amd64
pkg: github.com/bytedance/sonic/decoder
cpu: Intel(R) Xeon(R) Platinum 8260 CPU @ 2.40GHz
BenchmarkSkipValidate/mismatched-field/validate-32                114846             10841 ns/op
BenchmarkSkipValidate/mismatched-field/fast-32                    878814              1172 ns/op
BenchmarkSkipValidate/ommited-field/validate-32                   110401             11003 ns/op
BenchmarkSkipValidate/ommited-field/fast-32                      1000000              1073 ns/op
BenchmarkSkipValidate/redundant-array/validate-32                  52734             22754 ns/op
BenchmarkSkipValidate/redundant-array/fast-32                     111651             11742 ns/op
BenchmarkSkipValidate/unknown-field/validate-32                    97878             10872 ns/op
BenchmarkSkipValidate/unknown-field/fast-32                      1000000              1150 ns/op
BenchmarkSkipValidate/empty-struct/validate-32                    115086             11182 ns/op
BenchmarkSkipValidate/empty-struct/fast-32                       1000000              1147 ns/op
BenchmarkSkipValidate/mismatched-elem/validate-32                 104296             12210 ns/op
BenchmarkSkipValidate/mismatched-elem/fast-32                     758089              1458 ns/op