Request price graph data from new endpoint.

[AnthonyLaw]

https://pro.coinmarketcap.com/

Note: It contains an API secret key, it no suitable implement in Explorer directly. We should implement it to the statistics-service server, and fetch data from there.

[JackNEM]

Following up about the cost of implementing

[AnthonyLaw]

The https://min-api.cryptocompare.com/ had already listed XYM in the API endpoint.
we can re-active back the price chart compoment.