Add SemaDB VST wrapper (#11484)
- **Description**: Adding vectorstore wrapper for
[SemaDB](https://rapidapi.com/semafind-semadb/api/semadb).
- **Issue**: None
- **Dependencies**: None
- **Twitter handle**: semafind
Checks performed:
- [x] `make format`
- [x] `make lint`
- [x] `make test`
- [x] `make spell_check`
- [x] `make docs_build`
Documentation added:
- SemaDB vectorstore wrapper tutorial
