feat(ui-ux): show private key

[lykalabrada]

What this PR does / why we need it:

Which issue(s) does this PR fixes?:

Fixes #

Additional comments?:

Developer Checklist:

• [ ] Read your code changes at least once
• [ ] Tested on iOS/Android device (e.g, No crashes, library supported etc.)
• [ ] No console errors on web
• [ ] Tested on Light mode and Dark mode*
• [ ] Your UI implementation visually matched the rendered design*
• [ ] Unit tests*
• [ ] Added e2e tests*
• [ ] Added translations*

[github-actions[bot]]

Missing Translations Report

The following translations are missing for this pull request.

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[github-actions[bot]]

Build preview for DeFiChain Wallet is ready!

Built with commit e05ae8fed8aede6b6c1234322fc7b6430990eb5e

https://expo.io/@defichain/wallet?release-channel=pr-preview-4116

[codecov-commenter]

Codecov Report

Merging #4116 (d5d4ec2) into main (b320ad0) will decrease coverage by 3.53%. The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main    #4116      +/-   ##
==========================================
- Coverage   56.11%   52.59%   -3.53%     
==========================================
  Files         438      439       +1     
  Lines       12312    12330      +18     
  Branches     4069     4072       +3     
==========================================
- Hits         6909     6485     -424     
- Misses       5319     5762     +443     
+ Partials       84       83       -1     

Files	Coverage Δ
...ppNavigator/screens/Settings/SettingsNavigator.tsx	100.00% <ø> (ø)
...creens/Settings/screens/WalletPrivateKeyScreen.tsx	0.00% <0.00%> (ø)
...or/screens/Portfolio/screens/AddressBookScreen.tsx	0.00% <0.00%> (ø)

... and 41 files with indirect coverage changes

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