Add sentence-transformers library_name and filtering tags

Hello!

## Pull Request Overview
* Add library_name, filtering tags, and pipeline_tag

## Details
We forgot to include this in a prior PR, meaning that this model didn't yet show up when filtering for sparse Sentence Transformer models here: https://huggingface.co/models?library=sentence-transformers&other=sparse

cc @tformal

- Tom Aarsen

README.md

@@ -9,6 +9,10 @@ tags:
 - passage-retrieval
 - knowledge-distillation
 - document encoder
+- sparse-encoder
+- sparse
+pipeline_tag: feature-extraction
+library_name: sentence-transformers
 datasets:
 - ms_marco
 ---