if an account has too many tokens, workbench stops responding

[SvenDowideit]

I just picked an account on mainnet who'd response to getParsedTokenAccountsByOwner() retuens 19MB of data

see https://explorer.solana.com/address/6ZRCB7AAqGre6c72PRz3MHLC73VMYvJ8bi9KHf1HFpNk/tokens

TODO: see if we can get paging added to the solana API

the UI freezes, presumably because its busy parsing that data.

`

Originally posted by @SvenDowideit in #263 (comment)

[SvenDowideit]

I don't think this can be dealt with in 0.4.0, because we need to avoid making the getParsedTokenAccountsByOwner() call entirely - the lockup is during the wait for the fetch() inside this, not in our code.

its really a scalability issue in the solana API