chore: add benchmark with fastjson

[liuq19]

What type of PR is this?

test

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(Optional) More detailed description for this PR(en: English/zh: Chinese).

en:
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benchmark command SONIC_NO_ASYNC_GC=1 GOMAXPROCS=8 go test -v -run=none -bench="BenchmarkParse.*Sonic.*|BenchmarkParse.*Fastjson.*|BenchmarkGet.*Sonic.*|BenchmarkGet.*Fastjson.*" ./external_jsonlib_test/benchmark_test

benchmark results

goos: linux
goarch: amd64
pkg: github.com/bytedance/sonic/external_jsonlib_test/benchmark_test
cpu: Intel(R) Xeon(R) Platinum 8336C CPU @ 2.30GHz
BenchmarkParseSeven_Sonic
BenchmarkParseSeven_Sonic-8                   111814          9079 ns/op    1435.78 MB/s
BenchmarkParseSeven_Parallel_Sonic
BenchmarkParseSeven_Parallel_Sonic-8          395978          3321 ns/op    3925.45 MB/s
BenchmarkParseOne_Fastjson
BenchmarkParseOne_Fastjson-8                   22285         57015 ns/op     228.62 MB/s
BenchmarkParseOne_Parallel_Fastjson
BenchmarkParseOne_Parallel_Fastjson-8          29853         35314 ns/op     369.12 MB/s
BenchmarkParseSeven_Fastjson
BenchmarkParseSeven_Fastjson-8                 25088         51720 ns/op     252.03 MB/s
BenchmarkParseSeven_Parallel_Fastjson
BenchmarkParseSeven_Parallel_Fastjson-8        35427         37848 ns/op     344.40 MB/s
BenchmarkGetOne_Sonic
BenchmarkGetOne_Sonic-8                       810714          1539 ns/op    8467.42 MB/s
BenchmarkGetOne_Parallel_Sonic
BenchmarkGetOne_Parallel_Sonic-8             5403757           199.3 ns/op  65404.74 MB/s
BenchmarkGetByKeys_Sonic
BenchmarkGetByKeys_Sonic-8                    920173          1322 ns/op    9860.04 MB/s
BenchmarkGetOne_Fastjson
BenchmarkGetOne_Fastjson-8                     24112         48641 ns/op     267.99 MB/s
BenchmarkGetOne_Parallel_Fastjson
BenchmarkGetOne_Parallel_Fastjson-8            33621         35112 ns/op     371.24 MB/s
PASS
ok      github.com/bytedance/sonic/external_jsonlib_test/benchmark_test 17.190s

(Optional) Which issue(s) this PR fixes:

Fixes #752

(optional) The PR that updates user documentation: