feat: Add missing Key logic

[0xivanov]

Description:

Add missing From/To bytes functionality to Keys

Related issue(s):

Fixes #1015

Notes for reviewer:

Checklist

• [x] Documented (Code comments, README, etc.)
• [x] Tested (unit, integration, etc.)

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 83.33333% with 4 lines in your changes missing coverage. Please review.

Project coverage is 73.55%. Comparing base (c8d9fb0) to head (e72a960). Report is 1 commits behind head on main.

Files	Patch %	Lines
crypto.go	77.77%	1 Missing and 1 partial :warning:
transaction.go	0.00%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1016 +/- ## ========================================== + Coverage 73.52% 73.55% +0.02% ========================================== Files 168 168 Lines 23733 23755 +22 ========================================== + Hits 17450 17473 +23 + Misses 5578 5576 -2 - Partials 705 706 +1 ```

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[sonarcloud[bot]]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud