VoyageAI reranking (#12111)

* - refactor the base
 - adding new test case to validate the code works with API key stored as env.variable

* Batch size default value

* Remove unused constant
Correct the code

* Corrections due to comments

* Corrections
New tests

* Adding truncation attribute
Refactoring
Remove useless test

* Remove default model
Add tests
Reformat, etc

* VoyageAI rerank v0.1

* Adding an example with VoyageAI embeddings and rerank

* Adding an example with VoyageAI embeddings and rerank

* Adding an example with VoyageAI embeddings and rerank

* Correcting the BUILD file problems

* Remove the wrongly placed notebook

* Correction

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Co-authored-by: fodizoltan <zoltan@conway.expert>
Co-authored-by: Yujie Qian <thomasq0809@gmail.com>