feat: custom json marshaling implementation, replace json and yaml library (#89)

* chore: replace gopkg.in/yaml.v3 vs goccy/go-yaml; replace encoding/json with bytedance/sonic

* fix: yaml unmarshal panic

* feat: custom json marshaler implementation

* chore: fix import and err marshal handling

---------

Co-authored-by: yusing <yusing@6uo.me>

internal/net/gphttp/error.go

@@ -2,11 +2,12 @@ package gphttp
 
 import (
 	"context"
-	"encoding/json"
 	"errors"
 	"net/http"
 	"syscall"
 
+	"github.com/yusing/go-proxy/pkg/json"
+
 	"github.com/yusing/go-proxy/internal/gperr"
 	"github.com/yusing/go-proxy/internal/net/gphttp/httpheaders"
 )