Explorer does not properly represent large token amounts

[SethDusek]

Hi, this issue is similar to ergoplatform/ergo#1900 where the frontend does not represent large numbers properly due to JavaScript's number type not being large enough.

The following testnet address displays this issue: https://testnet.ergoplatform.com/en/addresses/3WwkxVkCiN5PKa4CLg72aX2XR53QfGRZmfJxEgiQEqsMmi59ULwq

Note that both of these tokens have a supply of 9223372036854775807 but they're both shown incorrectly here. The JSON endpoint for address balances correctly shows the actual amount https://api-testnet.ergoplatform.com/api/v1/addresses/3WwkxVkCiN5PKa4CLg72aX2XR53QfGRZmfJxEgiQEqsMmi59ULwq/balance/confirmed but using JSON.parse corrupts them.

Also, one of these tokens has 0 decimals and the other has 1, causing further precision issues when the frontend divides the number by the number of decimal points