[Feature] Extract text from documents

[mawandm]

Description
As a user, I'd like to extract text from the document.

Detail
Text extraction is useful to allow for intermediary steps to document ingestion. This will be allow for other processes such as;

1. Data cleansing
2. Data exclusion based on an exclusion list.
3. Approval workflows

Acceptance Criteria

1. An API /v1/extractions/text in the RAG microservice.
2. Extraction path added to the API microservice during document processing.
3. Persisting the extracted text to an external SQL datasource.