T2447
Depends on D11942
Add support for cached token info.
The finalizeTokenArray function will accept an object, cachedTokenInfoById. This object is scanned to see what token info is already in cache. If token info is in this object, then Cashtab will not make an API call to get it.
cacheTokenInfoById will be added to local storage in a later diff on this stack. For now, the function will work even if it is not provided.