Feat 3.0 scratch

[hoffmannjan]

Closes https://github.com/casper-ecosystem/casper-js-sdk/issues/412

[codecov[bot]]

Codecov Report

:exclamation: No coverage uploaded for pull request base (feat-3.0@e74c611). Click here to learn what that means. The diff coverage is 92.88%.

:exclamation: Current head 908b3da differs from pull request most recent head ef9c656. Consider uploading reports for the commit ef9c656 to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## feat-3.0 #403 +/- ## =========================================== Coverage ? 82.54% =========================================== Files ? 29 Lines ? 1369 Branches ? 145 =========================================== Hits ? 1130 Misses ? 178 Partials ? 61 ``` | [Components](https://app.codecov.io/gh/casper-ecosystem/casper-js-sdk/pull/403/components?src=pr&el=components&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=casper-ecosystem) | Coverage Δ | | |---|---|---| | [@casper-js-sdk/types](https://app.codecov.io/gh/casper-ecosystem/casper-js-sdk/pull/403/components?src=pr&el=component&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=casper-ecosystem) | `∅ <0.00%> (?)` | | | [@casper-js-sdk/keys](https://app.codecov.io/gh/casper-ecosystem/casper-js-sdk/pull/403/components?src=pr&el=component&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=casper-ecosystem) | `∅ <0.00%> (?)` | |