rename `XsAI`, `Xsai` to `XSAI`

[kwaa]

discussed here: #98 (comment)

Files to be modified:

• https://github.com/VoltAgent/voltagent/blob/main/packages/voice/src/providers/xsai/types.ts
• https://github.com/VoltAgent/voltagent/blob/main/packages/voice/src/providers/xsai/index.ts
• https://github.com/VoltAgent/voltagent/blob/main/packages/xsai/src/index.ts

[omeraplak]

Thanks @kwaa ! 🙌
Who would like to take this issue? We’d love your help happy to support if you need anything!

[Ajay-Satish-01]

@omeraplak I can take this up.

[omeraplak]

Thank you @Ajay-Satish-01 . Released 💥