Extend WAX typescript interface for methods taking NaiAssets

The following discussion from !112 (merged) should be addressed:

• @bwrona started a discussion:

  Can you extend API by overloaded versions taking NaiAsset as input parameter? This way we will simplify usage in case when i.e. some balance or a totalVestingFundHive (most probable) value(s) are taken from the API call Similar change should be done for hbdToHive