books: Get order book

curl 'https://www.okx.com/api/v5/market/books?instId=BTC-USDT'

import requests

resp = requests.get(
    "https://www.okx.com/api/v5/market/books",
    params={
        'instId': 'BTC-USDT',
    },
)
data = resp.json()

import zingu_apis

api = zingu_apis.api("okx")
result = api.fetch("market/books", instId="BTC-USDT")

for item in result:
    print(item)

const resp = await fetch("https://www.okx.com/api/v5/market/books?instId=BTC-USDT");
const data = await resp.json();

curl 'https://www.okx.com/api/v5/market/books?instId=BTC-USDT&sz=1'

import requests

resp = requests.get(
    "https://www.okx.com/api/v5/market/books",
    params={
        'instId': 'BTC-USDT',
        'sz': '1',
    },
)
data = resp.json()

import zingu_apis

api = zingu_apis.api("okx")
result = api.fetch("market/books", instId="BTC-USDT", sz=1)

for item in result:
    print(item)

const resp = await fetch("https://www.okx.com/api/v5/market/books?instId=BTC-USDT&sz=1");
const data = await resp.json();