Text splitters ✂️

We are gradually introducing a plugin system for vectorstores. The first step is enable multiple text splitters to be used via the API when ingesting documetns.

Big shout out to @yusofy for the these contributions!

What's Changed

• Fix issue with deleting Agents by @homanp in https://github.com/homanp/superagent/pull/111
• Vectorstore base by @yusofy in https://github.com/homanp/superagent/pull/110
• Add Ability for different text splitters by @yusofy in https://github.com/homanp/superagent/pull/112

Full Changelog: https://github.com/homanp/superagent/compare/v.0.0.19...v.0.0.20