S3 vector client autoconfiguration

[MatejNedic]

📢 Type of change

• Bugfix
• New feature
• Enhancement
• Refactoring

📜 Description

💡 Motivation and Context

💚 How did you test it?

📝 Checklist

• I reviewed submitted code
• I added tests to verify changes
• I updated reference documentation to reflect the change
• All tests passing
• No breaking changes

🔮 Next steps

[maciejwalkowiak]

As far as i can see, s3vectors library does not depend on any s3 library. Perhaps it would be better to separate it in io.awspring.cloud.autoconfigure.s3vectors package?