feat: create and delete developer sandboxes

[vegeris]

Changelog

(Add a note with features or fixes that change the user experience for release notes)

Summary

(Please describe the goal of this pull request and mention any related issue numbers)

Requirements

• I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.

[codecov]

Codecov Report

❌ Patch coverage is 69.03766% with 74 lines in your changes missing coverage. Please review.
✅ Project coverage is 65.54%. Comparing base (9ab82a5) to head (98ecc15).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/api/sandbox.go	0.00%	46 Missing ⚠️
cmd/sandbox/create.go	86.36%	10 Missing and 8 partials ⚠️
cmd/sandbox/delete.go	83.05%	6 Missing and 4 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #389      +/-   ##
==========================================
+ Coverage   65.19%   65.54%   +0.34%     
==========================================
  Files         218      220       +2     
  Lines       17981    18359     +378     
==========================================
+ Hits        11723    12033     +310     
- Misses       5164     5221      +57     
- Partials     1094     1105      +11     

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