* add staking functions first commit

* fix nominate test and run linter

* use yarn docs

* move UnsignedTransaction into ./utils to enable generic tx construction

* update docs for UnsignedTransaction move

* rename TxInfo and TEST_TX_INFO to specify that they are for balance transfer

* move TxInfo into interfaces to reduce duplicate code

* make decode somewhat generic

* rename util/interfaces to util/types

* add encodings to tests

* fix: Put function importPrivateKey in correct file

* Fix import

* feat: Generic `decode` also decodes unsigned

* dpcs

* Don't expose decode*

* decode doesn't decode signingPayload

BREAKING CHANGE:

- `decodeTx` has been renamed to `decodeSignedTx` for clarity

* fix: Fix keepAlive

* feat: Add decodeUnsignedTx

* Generate docs

* Export new functions