Add DataPlane API Support

[hectorcast-db]

Changes

Add DataPlane API Support

Tests

Manual test:

input := []string{}
input = append(input, "Hello, I'm a language model,")
_, err := w.ServingEndpointsDataPlane.Query(context.Background(), serving.QueryEndpointInput{
    Name:   <...>,
    Inputs: input,
})
require.NoError(t, err)

• [x] make test passing
• [x] make fmt applied
• [ ] relevant integration tests applied

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 16.74208% with 184 lines in your changes missing coverage. Please review.

Project coverage is 7.09%. Comparing base (d098b1a) to head (c5cfd49).

Files	Patch %	Lines
...ing/mock_serving_endpoints_data_plane_interface.go	5.81%	81 Missing :warning:
service/serving/impl.go	0.00%	31 Missing :warning:
service/catalog/model.go	0.00%	15 Missing :warning:
service/serving/api.go	0.00%	13 Missing :warning:
openapi/code/method.go	0.00%	12 Missing :warning:
httpclient/request.go	0.00%	8 Missing :warning:
openapi/code/service.go	11.11%	8 Missing :warning:
httpclient/oauth_token.go	0.00%	6 Missing :warning:
experimental/mocks/mock_workspace_client.go	16.66%	5 Missing :warning:
client/client.go	0.00%	4 Missing :warning:
... and 1 more

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #936 +/- ## ======================================== + Coverage 7.04% 7.09% +0.04% ======================================== Files 282 284 +2 Lines 65329 65542 +213 ======================================== + Hits 4602 4648 +46 - Misses 60418 60584 +166 - Partials 309 310 +1 ```

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