feat(dapi): `identityBalance` nodejs dapi-client implementation

[owl352]

Issue being fixed or feature implemented

At this moment, we can't call identityBalance method from nodejs dapi-client, because this method is not implemented for nodejs

What was done?

Has created methods getIdentityBalanceFactore, getIdentityResponse. Also has been updated PlatformMethodsFacade.js and PlatformPromiseClient.js

How Has This Been Tested?

Manual testing was performed on a local testnet node, which has created via dashmate

Breaking Changes

No breaking changes

Checklist:

• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [ ] I have added or updated relevant unit/integration/functional/e2e tests
• [x] I have added "!" to the title and described breaking changes in the corresponding section if my code contains any
• [x] I have made corresponding changes to the documentation if needed

For repository code-owners and collaborators only

• [ ] I have assigned this pull request to a milestone