Deepsights-api

- Added language filtering for search
- Expose text and vector search for content store

- Added date range filtering for content store searches

- Introduced user client, removing answers and reports from API key based super-access
- Restructured API clients to use API resources for improved modularity
- Retried sync answers v1
- Support for new hybrid SCS endpoint
- Introduced documents.list() method
- Added creation_date to document model
- Quality of life improvements to documents.download()

- First public release of `deepsights-api`