{key}: Get TradeStats development indicators

curl 'https://wits.worldbank.org/API/V1/SDMX/V21/rest/data/DF_WITS_TradeStats_Development/A.USA.WLD.Total.GDP?startPeriod=2020&endPeriod=2020'

import requests

resp = requests.get(
    "https://wits.worldbank.org/API/V1/SDMX/V21/rest/data/DF_WITS_TradeStats_Development/A.USA.WLD.Total.GDP",
    params={
        'startPeriod': '2020',
        'endPeriod': '2020',
    },
)
data = resp.json()

import zingu_apis

api = zingu_apis.api("world-bank-wits")
result = api.fetch("data/DF_WITS_TradeStats_Development/{key}", startPeriod=2020, endPeriod=2020)

for item in result:
    print(item)

const resp = await fetch("https://wits.worldbank.org/API/V1/SDMX/V21/rest/data/DF_WITS_TradeStats_Development/A.USA.WLD.Total.GDP?startPeriod=2020&endPeriod=2020");
const data = await resp.json();