skctl snapshot

[drmorr0]

• [x] I certify that this PR does not contain any code that has been generated with GitHub Copilot or any other AI-based code generation tool, in accordance with this project's policies.

Description

Implements the skctl snapshot command

(see https://kubernetes.slack.com/archives/C04RG2YSK16/p1709053628718169 for more context)

Testing done

• manual testing
• make test

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 22.10526% with 74 lines in your changes are missing coverage. Please review.

Project coverage is 69.49%. Comparing base (a8efc8a) to head (d4d4ed7).

Files	Patch %	Lines
cli/snapshot.rs	0.00%	33 Missing :warning:
src/watch/dyn_obj_watcher.rs	34.48%	19 Missing :warning:
src/watch/pod_watcher.rs	29.16%	17 Missing :warning:
cli/args.rs	0.00%	4 Missing :warning:
cli/main.rs	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #95 +/- ## ========================================== - Coverage 71.53% 69.49% -2.05% ========================================== Files 37 38 +1 Lines 1820 1898 +78 ========================================== + Hits 1302 1319 +17 - Misses 518 579 +61 ```

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