feat: add logging and collector implementations

- Introduced `hertzx` package with `NewHertz` function for server initialization.
- Implemented `logx` package with various log collectors: Console, Loki, Elasticsearch, and Prometheus.
- Added `Logger` struct to manage logging levels and collectors.
- Created environment variable loading functionality in `osx` package to support configuration.
- Enhanced logging capabilities with structured log entries and asynchronous collection.

osx/osx.go

@@ -0,0 +1,78 @@
+package osx
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/joho/godotenv"
+)
+
+func init() {
+	// 读取目录下的所有 .env 文件，加载环境变量
+	// 生产环境由于部署在kubernetes等平台，通常会直接通过环境变量注入配置
+	// 因此这里的加载主要用于开发环境
+	loadDotEnvFiles()
+}
+
+func GetEnv(key string, defaultValue ...string) string {
+	if value, exists := os.LookupEnv(key); exists {
+		return value
+	}
+	if len(defaultValue) > 0 {
+		return defaultValue[0]
+	}
+	return ""
+}
+
+func GetEnvInt(key string, defaultValue int) int {
+	if valueStr, exists := os.LookupEnv(key); exists {
+		var value int
+		_, err := fmt.Sscanf(valueStr, "%d", &value)
+		if err == nil {
+			return value
+		}
+	}
+	return defaultValue
+}
+
+// GetEnvBool 支持 "true", "1", "True", "TRUE" 返回 true
+// 支持 "false", "0", "False", "FALSE" 返回 false
+// 如果环境变量不存在或无法解析，则返回 defaultValue
+func GetEnvBool(key string, defaultValue bool) bool {
+	if valueStr, exists := os.LookupEnv(key); exists {
+		switch valueStr {
+		case "true", "1", "True", "TRUE":
+			return true
+		case "false", "0", "False", "FALSE":
+			return false
+		}
+	}
+	return defaultValue
+}
+
+func GetEnvT[T any](key string, parser func(string) (T, error), defaultValue T) T {
+	if valueStr, exists := os.LookupEnv(key); exists {
+		if value, err := parser(valueStr); err == nil {
+			return value
+		}
+	}
+	return defaultValue
+}
+
+func loadDotEnvFiles() {
+	dotEnvFiles := []string{".env.local", ".env", ".env.development", ".env.production"}
+	existedFiles := []string{}
+	for _, file := range dotEnvFiles {
+		if _, err := os.Stat(file); err == nil {
+			existedFiles = append(existedFiles, file)
+		}
+	}
+	if len(existedFiles) == 0 {
+		return
+	}
+	// 按顺序加载，后面的会覆盖前面的
+	err := godotenv.Load(existedFiles...)
+	if err != nil {
+		fmt.Printf("Error loading .env files: %v\n", err)
+	}
+}