feat: impl'd server & token validation (incomplete)

[adietish]

fixes eclipse-che/che#23577

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 57 lines in your changes missing coverage. Please review.
✅ Project coverage is 0.00%. Comparing base (71098f6) to head (6460d3b).
⚠️ Report is 223 commits behind head on main.

Files with missing lines	Patch %	Lines
...ools/gateway/view/steps/DevSpacesServerStepView.kt	0.00%	57 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##            main    #181     +/-   ##
=======================================
  Coverage   0.00%   0.00%             
=======================================
  Files          4      31     +27     
  Lines         26    1078   +1052     
  Branches       0     190    +190     
=======================================
- Misses        26    1078   +1052     

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