Use contract address for fetching prices when possible

[Douglashdaniel]

Description

Consider using Contract Address for Fetching Token Prices

Currently we are using the Tokens Symbol as a param to fetch the price of a Token from CoinGecko.
In some occasions the Symbol is different than the token-id param required by CoinGecko's api which will cause an incorrect price.

[bbondy]

Dropping priority of this since we have a server side fix now for better symbol matching

[waylonflinn]

Server side fix may not have addressed all issues.
I posted some details about a problem I encountered today on the community forum:
https://community.brave.com/t/wallet-pointing-to-the-incorrect-price-for-a-coin/305383/4?u=waylonflinn

[bbondy]

Note when the server supports lookup by contract address, I think we'll only be able to use it for lookups with Ethereum contract addresses. We'll still need to query by symbol for when the tokens are on a different network.

[srirambv]

Brave	1.34.78 Chromium: 97.0.4692.56 (Official Build) (64-bit)
Revision	adefa7837d02a07a604c1e6eff0b3a09422ab88d-refs/branch-heads/4692@{#1247}
OS	☑️ Linux	☑️ Windows 11 Version Dev (Build 22523.1000)	☑️ macOS Version 12.0.1 (Build 21A559)
Verified steps from brave/brave-core#11557 Verified selecting custom token shows asset price fetched from CoinGecko API
	19574-Linux.mp4	19574-Win.mov	19574-macOS.mov