feat: support streaming IO

[AsterDY]

Benchmark

• decoder

goos: darwin
goarch: amd64
pkg: github.com/bytedance/sonic/decoder
cpu: Intel(R) Core(TM) i9-9880H CPU @ 2.30GHz
BenchmarkDecodeStream_Sonic/single-16    1000000             859.3 ns/op            2114 B/op          8 allocs/op
BenchmarkDecodeStream_Sonic/double-16    1000000              2594 ns/op            8774 B/op         15 allocs/op
BenchmarkDecodeStream_Sonic/halt-16      1000000              6007 ns/op            3261 B/op         15 allocs/op
BenchmarkDecodeStream_Std/single-16      1000000              6199 ns/op            2840 B/op         14 allocs/op
BenchmarkDecodeStream_Std/double-16      1000000             11342 ns/op            2920 B/op         19 allocs/op
BenchmarkDecodeStream_Std/halt-16        1000000             11358 ns/op            2984 B/op         16 allocs/op
BenchmarkDecodeStream_Jsoniter/single-16 1000000              4886 ns/op            4168 B/op         21 allocs/op
BenchmarkDecodeStream_Jsoniter/double-16 1000000              9469 ns/op            7288 B/op         34 allocs/op
BenchmarkDecodeStream_Jsoniter/halt-16   1000000              8218 ns/op            4312 B/op         23 allocs/op

• encoder

goarch: amd64
pkg: github.com/bytedance/sonic/encoder
cpu: Intel(R) Core(TM) i9-9880H CPU @ 2.30GHz
BenchmarkEncodeStream_Sonic/single-16            1000000              1219 ns/op            4412 B/op          5 allocs/op
BenchmarkEncodeStream_Sonic/double-16            1000000              2425 ns/op            8723 B/op         11 allocs/op
BenchmarkEncodeStream_Sonic/compatible-16        1000000              3888 ns/op            1535 B/op          6 allocs/op
BenchmarkEncodeStream_Std/single-16              1000000              5195 ns/op             456 B/op         10 allocs/op
BenchmarkEncodeStream_Std/double-16              1000000             10586 ns/op             913 B/op         20 allocs/op
BenchmarkEncodeStream_Std/compatible-16          1000000              5024 ns/op             456 B/op         10 allocs/op
BenchmarkEncodeStream_Jsoniter/single-16         1000000              2899 ns/op            1280 B/op          4 allocs/op
BenchmarkEncodeStream_Jsoniter/double-16         1000000              5937 ns/op            2561 B/op          8 allocs/op
BenchmarkEncodeStream_Jsoniter/compatible-16     1000000              3486 ns/op            3743 B/op          9 allocs/op