[DDW-106] Wallet import feature

[nikolaglumac]

This PR implements "Wallet Import" feature.

Todos

• Integrate updated export-wallets utility (export legacy wallets in a friendly way for automatic import in cardano-wallet cardano-sl#4278)
• Use correct default Daedalus mainnet state dir path (@nikolaglumac)
• Enable state dir selection (@nikolaglumac)
• Implement UI components (@DeeJayElly)
• Implement theme color variables (@DeeJayElly)
• Implement alignment on overlays (@DeeJayElly)
• Implement UI logic (@daniloprates)
• Implement tests - To be implemented within DDW-154

Screenshots

• TBD

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Testing Checklist

• Slack QA thread
• TBD

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Review Checklist

Basics

• PR has been assigned and has appropriate labels (feature/bug/chore, release-x.x.x)
• PR is updated to the most recent version of the target branch (and there are no conflicts)
• PR has a good description that summarizes all changes
• PR has default-sized Daedalus window screenshots or animated GIFs of important UI changes:
  • In English
  • In Japanese
• CHANGELOG entry has been added to the top of the appropriate section (Features, Fixes, Chores) and is linked to the correct PR on GitHub
• Automated tests: All acceptance and unit tests are passing (yarn test)
• Manual tests (minimum tests should cover newly added feature/fix): App works correctly in development build (yarn dev)
• Manual tests (minimum tests should cover newly added feature/fix): App works correctly in production build (yarn package / CI builds)
• There are no flow errors or warnings (yarn flow:test)
• There are no lint errors or warnings (yarn lint)
• There are no prettier errors or warnings (yarn prettier:check)
• There are no missing translations (running yarn manage:translations produces no changes)
• Text changes are proofread and approved (Jane Wild / Amy Reeve)
• Japanese text changes are proofread and approved (Junko Oda)
• UI changes look good in all themes (Alexander Rukin)
• Storybook works and no stories are broken (yarn storybook)
• In case of dependency changes yarn.lock file is updated

Code Quality

• Important parts of the code are properly commented and documented
• Code is properly typed with flow
• React components are split-up enough to avoid unnecessary re-renderings
• Any code that only works in main process is neatly separated from components

Testing

• New feature/change is covered by acceptance tests
• New feature/change is manually tested and approved by QA team
• All existing acceptance tests are still up-to-date
• New feature/change is covered by Daedalus Testing scenario
• All existing Daedalus Testing scenarios are still up-to-date

After Review

• Merge the PR
• Delete the source branch
• Move the ticket to done column on the YouTrack board
• Update Slack QA thread by marking it with a green checkmark

[alexander-rukin]

• pen is not centered
• only pen changes cursor style (not whole square) -> no hover effect for square

[thedanheller]

Amazing work, Daedalus team 🚀

[alexander-rukin]

@yakovkaravelov this should be at least 52px (I think) -> so it should be around 6px distance between the input field and the error