Support more Embedders in Haystack 2.x

[julian-risch]

Embedders

### Tasks
- [ ] AmazonBedrockEmbedder
- [ ] https://github.com/deepset-ai/haystack-core-integrations/issues/137
- [ ] https://github.com/deepset-ai/haystack-core-integrations/issues/138
- [x] SentenceTransformers
- [x] HuggingfaceTEI
- [x] OpenAIEmbeddings
- [x] Cohere
- [x] JinaAI
- [x] Gradient
- [x] Instructor