Сryptocurrency development analysis

Description

This adds functionality to the node adaptor to translate from `SlotId` to `Timestamp`. This will be needed when constructing transaction metadata.

## Linked issue

https://iohk.myjetbrains.com/youtrack/issue/CBR-387

## Type of change

— [ ] 🐞 Bug fix (non-breaking change which fixes an issue)
— [x] 🛠 New feature (non-breaking change which adds functionality)
— [ ] ⚠️ Breaking change (fix or feature that would cause existing functionality to change)
— [ ] 🏭 Refactoring that does not change existing functionality but does improve things like code readability, structure etc
— [ ] 🔨 New or improved tests for existing code
— [ ] ⛑ git-flow chore (backport, hotfix, etc)

## Developer checklist

— [ ] I have read the [style guide](https://github.com/input-output-hk/cardano-sl/blob/develop/docs/style-guide.md) document, and my code follows the code style of this project.
— [ ] If my code deals with exceptions, it follows the [guidelines](https://github.com/input-output-hk/cardano-sl/blob/develop/docs/exceptions.md).
— [ ] I have updated any documentation accordingly, if needed. Documentation changes can be reflected in opening a PR on [cardanodocs.com](https://github.com/input-output-hk/cardanodocs.com), amending the inline [Haddock](https://www.haskell.org/haddock/) comments, any relevant README file or one of the document listed in the [docs](https://github.com/input-output-hk/cardano-sl/tree/develop/docs) directory.
— [ ] CHANGELOG entry has been added and is linked to the correct PR on GitHub.

## Testing checklist

— [ ] I have added tests to cover my changes.
— [ ] All new and existing tests passed.

## QA Steps

## Screenshots (if available)

You can view, comment on, or merge this pull request online at:

https://github.com/input-output-hk/cardano-sl/pull/3433

— Commit Summary —

* [CBR-387] Add `getSlotStart` to the node adaptor

— File Changes —

M wallet-new/src/Cardano/Wallet/Kernel/NodeStateAdaptor.hs (45)

— Patch Links —

https://github.com/input-output-hk/cardano-sl/pull/3433.patch
https://github.com/input-output-hk/cardano-sl/pull/3433.diff

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