fix(server): add schema field ID to dataset REST API

[rot1024]

No description provided.

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✅ Deploy Preview for reearth-web canceled.

Name	Link
🔨 Latest commit	ccc7d7b
🔍 Latest deploy log	https://app.netlify.com/sites/reearth-web/deploys/64a14c9993200b000863d8b7

[codecov]

Codecov Report

Merging #547 (ccc7d7b) into main (02e25c1) will increase coverage by 0.00%.
The diff coverage is 51.16%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #547   +/-   ##
=======================================
  Coverage   26.67%   26.67%           
=======================================
  Files        1343     1343           
  Lines      144960   144972   +12     
  Branches     3485     3485           
=======================================
+ Hits        38662    38667    +5     
- Misses     105154   105158    +4     
- Partials     1144     1147    +3     

Flag	Coverage Δ
server	36.28% <51.16%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
server/pkg/dataset/export.go	42.99% <0.00%> (ø)
server/pkg/property/value_camera.go	18.30% <0.00%> (ø)
server/pkg/property/value_typography.go	42.62% <0.00%> (ø)
server/pkg/value/bool.go	45.94% <0.00%> (ø)
server/pkg/value/coordinates.go	0.00% <0.00%> (ø)
server/pkg/value/latlng.go	25.80% <0.00%> (ø)
server/pkg/value/latlngheight.go	13.63% <0.00%> (ø)
server/pkg/value/number.go	24.40% <0.00%> (ø)
server/pkg/value/polygon.go	0.00% <0.00%> (ø)
server/pkg/value/rect.go	0.00% <0.00%> (ø)
... and 9 more