Resolve rate from coinGecko if exchange rate is not found

[Xiaolei-Shawn]

Description

• Resolve currency rate from coinGecko if its key is not found in exchangeRates.
• Fix a bug when calculating exchange rate that base and quote currency key are passed to function newGetExchangeRatesForCurrencies with wrong order:

  kwenta/hooks/useExchange.ts

  Line 278 in 51068f9

  () => newGetExchangeRatesForCurrencies(exchangeRates, quoteCurrencyKey, baseCurrencyKey),

After the fix, we should use rate but inverseRate to render title in exchange page

Related issue

Issue

Motivation and Context

The title in exchange won't show correct rate if one or both currencies are not found in exchange rates results.

How Has This Been Tested?

• Go to Exchange view
• Select sINR and DAI
• Tab title in browser should show correct exchange rate
• Switch currency to see title change

Screenshots (if appropriate):

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Name	Status	Preview	Updated
kwenta	✅ Ready (Inspect)	Visit Preview	Aug 23, 2022 at 10:30PM (UTC)

[platschi]

@Xiaolei-Shawn Kindly check lint errors :)

[Xiaolei-Shawn]

@Xiaolei-Shawn Kindly check lint errors :)

My bad! Fixed already. @platschi

[LeifuChen]

@Xiaolei-Shawn
I think the function signature is ordered like this by some reason. The rate on title has been fixed but it caused the issue for the calculation of the received amount.

[LeifuChen]

@Xiaolei-Shawn The rate of synthetic assets (the assets with the prefix s, which is fetching the price from rate not via coincgecko api) is not working now.

[LeifuChen]

Looks good to me.

[platschi]

Perfect, works as expected.