feat(task): support new AI Tasks spec

[heiruwu]

Because

• We are going to adopt new AI Tasks spec and remove data serialization between model-backend and ray-server
• We are going to use google.protobuf.struct as task input/output and validate them against jsonschema

This commit

• remove input/output data processing and serialization
• adopt new protobuf to replace task input message type to structpb
• add jsonschema load and validation

resolves INS-5269
resolves INS-5457
resolves INS-5460
resolves INS-5461
resolves INS-5424

[linear]

INS-5269 [BE] remove data serialization between `model-backend` <-> `ray-server`

INS-5457 [Inter.] Adopt New AI Task Spec in Backend

INS-5460 [Inter.] Removing data serialization

INS-5461 [Inter.] Refactor communication protocols between model-backend and ray-server to use google.protobuf.struct

[linear]

INS-5424 adopt latest ray proto in test models

[codecov]

Codecov Report

Attention: Patch coverage is 1.47493% with 668 lines in your changes missing coverage. Please review.

Project coverage is 3.70%. Comparing base (f519c82) to head (438c047).
Report is 17 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/jsonref/ref.go	0.00%	299 Missing ⚠️
pkg/handler/trigger.go	0.00%	184 Missing ⚠️
pkg/datamodel/jsonschema.go	0.00%	63 Missing ⚠️
pkg/service/service.go	0.00%	46 Missing ⚠️
pkg/worker/workflow.go	26.92%	17 Missing and 2 partials ⚠️
pkg/ray/rayserver/ray.pb.go	15.00%	17 Missing ⚠️
cmd/main/main.go	0.00%	11 Missing ⚠️
pkg/ray/ray.go	0.00%	8 Missing ⚠️
pkg/service/convert.go	0.00%	8 Missing ⚠️
cmd/worker/main.go	0.00%	6 Missing ⚠️
... and 2 more

Additional details and impacted files

@@           Coverage Diff            @@
##            main    #655      +/-   ##
========================================
+ Coverage   3.41%   3.70%   +0.29%     
========================================
  Files         64      62       -2     
  Lines      13780   10682    -3098     
========================================
- Hits         470     396      -74     
+ Misses     13263   10233    -3030     
- Partials      47      53       +6     

Flag	Coverage Δ
unittests	3.70% <1.47%> (+0.29%)	⬆️

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