[R-310] Test set generation improvements

[shahules786]

For Ragas 0.2, we released our third iteration of synthetic test generation for RAG. While developing this new approach we have kept some important feedback that we gathered from earlier versions

1. Ability to generalize over more data formats and domains.
2. Ability to customize and create scenarios related to one's own domain.
3. Ability to persist and resample Q&A from same list of documents w/o redoing preprocessing
4. Lower cost and faster iteration.

We have already noted some feedback from the community and we want to welcome more, hence this discussion thread. Please feel free share your thoughts and queries on the same. This will help us greatly improve the feature in coming weeks.

_R-310

Known issues

Quality enhancement

• Testset generation feedback #1568
• Creating Testdataset from dictionary/json file #1477
• Add support for synthesising multiturn conversation by @ahgraber

Documentation improvements

• Language adaptation for test generation
  • When I want to generate data in Chinese, this error message appears. What should I do? #1488
  • How to set the language type of the generated questions when creating a test set #1485
• Custom prompts for test generation
  • also noted in Testset generation feedback #1568