Switch to ref api to fetch whitelist tokens

[Megha-Dev-19]

Instead of hardcoding tokens list, switched to ref indexer to fetch the list of whitelisted tokens and also their prices.

[Megha-Dev-19]

@race-of-sloths include

[race-of-sloths]

@Megha-Dev-19 Thank you for your contribution! Your pull request is now a part of the Race of Sloths!

Current status: executed

Reviewer	Score
@petersalomonsen	3

Your contribution is much appreciated with a final score of 3!
You have received 107 (30 base + 55 weekly bonus + 25% lifetime bonus) Sloth points for this contribution

@petersalomonsen received 25 Sloth Points for reviewing and scoring this pull request.

Another weekly streak completed, well done @Megha-Dev-19! To keep your weekly streak and get another bonus make pull request next week! Looking forward to see you in race-of-sloths

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[petersalomonsen]

Should use https://www.npmjs.com/package/@near-js/jsonrpc-client

for such requests, but we can add that later.

[petersalomonsen]

@race-of-sloths score 3