refactor: introduce generics, reorganize GraphQL schema

[rot1024]

Use generics since Go v1.18 to reduce codes and improve function versatility. Also GraphQL schema was needed to be refactored.

[codecov]

Codecov Report

Merging #135 (224b879) into main (7ec76aa) will increase coverage by 0.00%.
The diff coverage is 1.24%.

@@           Coverage Diff            @@
##             main     #135    +/-   ##
========================================
  Coverage   36.67%   36.67%            
========================================
  Files         330      331     +1     
  Lines       29353    29891   +538     
========================================
+ Hits        10766    10964   +198     
- Misses      17582    17925   +343     
+ Partials     1005     1002     -3     

Impacted Files	Coverage Δ
internal/adapter/gql/context.go	0.00% <0.00%> (ø)
internal/adapter/gql/gqlmodel/convert_asset.go	0.00% <0.00%> (ø)
internal/adapter/gql/gqlmodel/convert_dataset.go	0.00% <0.00%> (ø)
internal/adapter/gql/gqlmodel/convert_layer.go	0.00% <0.00%> (ø)
internal/adapter/gql/gqlmodel/convert_plugin.go	0.00% <0.00%> (ø)
internal/adapter/gql/gqlmodel/convert_project.go	0.00% <0.00%> (ø)
internal/adapter/gql/gqlmodel/convert_property.go	1.30% <0.00%> (+0.11%)	⬆️
internal/adapter/gql/gqlmodel/convert_scene.go	0.00% <0.00%> (ø)
...ternal/adapter/gql/gqlmodel/convert_scene_align.go	0.00% <0.00%> (ø)
internal/adapter/gql/gqlmodel/convert_tag.go	0.00% <0.00%> (ø)
... and 126 more