feat(backend-native): expose lastRefreshTime via /cubesql API

[KSDaemon]

• add lastRefreshTime to load result in openapi spec
• feat(backend-native): expose lastRefreshTime via /cubesql API

Check List

• Tests have been run in packages where changes have been made if available
• Linter has been run for changed code
• Tests for the changes have been added if not covered yet
• Docs have been added / updated if required

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.94%. Comparing base (c6eca9c) to head (9666978).

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #10206      +/-   ##
==========================================
- Coverage   77.94%   77.94%   -0.01%     
==========================================
  Files         461      461              
  Lines       91235    91239       +4     
  Branches     3470     3470              
==========================================
  Hits        71117    71117              
- Misses      19622    19626       +4     
  Partials      496      496              

Flag	Coverage Δ
cube-backend	54.67% <ø> (ø)
cubesql	83.27% <100.00%> (-0.01%)	⬇️

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