[Feature Request] support that the context.Context is passed down

[yflau]

需求背景

Now the context.Context will not be passed down on the call path, some functions are difficult to implement, e.g., if I want to associate logs through trace_id, it's impossible.
当前context.Context并未在调用链路上确保传递，因此，一些功能难以实现，例如，通过trace_id实现关联日志的提取无法实现。

提案

To implement this, it seems that many changes to be done, e.g.

• yaoapp/gou/api.handler

// defaultHandler default handler
func (path Path) defaultHandler(getArgs func(c *gin.Context) []interface{}) func(c *gin.Context) {
	return func(c *gin.Context) {

		ctx, cancel := context.WithCancel(c.Request.Context())  // NOTE: context.Background() -> c.Request.Context()
		defer cancel()
		// defer debug.FreeOSMemory()
                ...
}

• yaoapp/xun/dbal/query/interfaces.go

type Query interface {
	// defined in the builder.go file
	...
	// defined in the query.go file
	Table(name string) Query
	Get(ctx context.Context, v ...interface{}) ([]xun.R, error) // NOTE: add ctx param
	MustGet(ctx context.Context, v ...interface{}) []xun.R      // NOTE: add ctx param
	...
}

• corresponding methods of yaoapp/xun/dbal/query/builder.Builder

func (builder *Builder) Get(ctx context.Context, v ...interface{}) ([]xun.R, error) { // NOTE: add ctx param
    // ...
}

额外补充

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