Add support for multiple transformers and clip modules

[antas-marcin]

What's being changed:

This PR adds support for multiple transformers and clip modules. It introduces new inferenceUrl setting that can be applied in transformers and clip modules configuration examples:

"text2vec-transformers": map[string]interface{}{
    "vectorizeClassName": false,
    "inferenceUrl":       "http://custom-server-url:8080",
    "properties":         []interface{}{"prompt"},
},

"multi2vec-clip": map[string]interface{}{
    "vectorizeClassName": false,
    "inferenceUrl":       "http://192.168.0.1:9090",
    "imageFields":        []interface{}{"image"},
},

Additionally in transformers module it's also possible to configure passage and query endpoints:

"text2vec-transformers": map[string]interface{}{
    "vectorizeClassName":  false,
    "passageInferenceUrl": "http://passage-server-url:8080",
    "queryInferenceUrl":   "http://query-server-url:8080",
},

Review checklist

• Documentation has been updated, if necessary. Link to changed documentation:
• Chaos pipeline run or not necessary. Link to pipeline:
• All new code is covered by tests where it is reasonable.
• Performance tests have been run or not necessary.

[sonarcloud]

Quality Gate failed

Failed conditions
23.2% Duplication on New Code (required ≤ 3%)

See analysis details on SonarCloud