feat: add sonic json support (#3184)

* feat: add sonic json support

* fix: add blank line in readme

go.mod

@@ -3,6 +3,7 @@ module github.com/gin-gonic/gin
 go 1.18
 
 require (
+	github.com/bytedance/sonic v1.3.2
 	github.com/gin-contrib/sse v0.1.0
 	github.com/go-playground/validator/v10 v10.10.0
 	github.com/goccy/go-json v0.9.10
@@ -17,13 +18,17 @@ require (
 )
 
 require (
+	github.com/chenzhuoyu/base64x v0.0.0-20220526154910-8bf9453eb81a // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/go-playground/locales v0.14.0 // indirect
 	github.com/go-playground/universal-translator v0.18.0 // indirect
+	github.com/klauspost/cpuid/v2 v2.0.14 // indirect
 	github.com/leodido/go-urn v1.2.1 // indirect
 	github.com/modern-go/concurrent v0.0.0-20180228061459-e0a39a4cb421 // indirect
 	github.com/modern-go/reflect2 v1.0.2 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/twitchyliquid64/golang-asm v0.15.1 // indirect
+	golang.org/x/arch v0.0.0-20220412001346-fc48f9fe4c15 // indirect
 	golang.org/x/crypto v0.0.0-20210711020723-a769d52b0f97 // indirect
 	golang.org/x/sys v0.0.0-20210806184541-e5e7981a1069 // indirect
 	golang.org/x/text v0.3.6 // indirect