feat: implement coinank free kline api and kline websocket (#1281)

- implement coinank free kline api in coinank_api.Kline
- implement coinank free kline ws in coinank_api.KlineWs. if needKline is true, kline data read from KlineCh. if needTicker is true, tickers data  read from TickersCh.

provider/coinank/coinank_api/kline.go

@@ -0,0 +1,79 @@
+package coinank_api
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"net/url"
+	"nofx/provider/coinank"
+	"nofx/provider/coinank/coinank_enum"
+	"strconv"
+	"time"
+)
+
+const MainApiUrl = "https://api.coinank.com"
+
+// Kline open free kline from coinank
+func Kline(ctx context.Context, symbol string, exchange coinank_enum.Exchange, ts int64, side coinank_enum.Side, size int,
+	interval coinank_enum.Interval) ([]coinank.KlineResult, error) {
+	paramsMap := make(map[string]string, 6)
+	paramsMap["symbol"] = symbol
+	paramsMap["exchange"] = string(exchange)
+	paramsMap["side"] = string(side)
+	paramsMap["size"] = strconv.Itoa(size)
+	paramsMap["ts"] = strconv.FormatInt(ts, 10)
+	paramsMap["interval"] = string(interval)
+	resp, err := get(ctx, "/api/kline/list/open", paramsMap)
+	if err != nil {
+		return nil, err
+	}
+	var result coinank.CoinankResponse[[][]float64]
+	err = json.Unmarshal([]byte(resp), &result)
+	if err != nil {
+		return nil, err
+	}
+	if !result.Success {
+		return nil, coinank.HttpError
+	}
+	klines := make([]coinank.KlineResult, len(result.Data))
+	for i, k := range result.Data {
+		klines[i].StartTime = int64(k[0] + 0.001)
+		klines[i].EndTime = int64(k[1] + 0.001)
+		klines[i].Open = k[2]
+		klines[i].Close = k[3]
+		klines[i].High = k[4]
+		klines[i].Low = k[5]
+		klines[i].Volume = k[6]
+		klines[i].Quantity = k[7]
+		klines[i].Count = k[8]
+	}
+	return klines, nil
+}
+
+func get(ctx context.Context, path string, paramsMap map[string]string) (string, error) {
+	data := url.Values{}
+	for key, value := range paramsMap {
+		data.Add(key, value)
+	}
+	fullURL := fmt.Sprintf("%s%s?%s", MainApiUrl, path, data.Encode())
+	request, err := http.NewRequestWithContext(ctx, "GET", fullURL, nil)
+	if err != nil {
+		return "", err
+	}
+	resp, err := client.Do(request)
+	if err != nil {
+		return "", err
+	}
+	defer resp.Body.Close()
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return "", err
+	}
+	return string(body), nil
+}
+
+var client = &http.Client{
+	Timeout: 30 * time.Second,
+}