Add top and bottom BubbleNips

[fischerscode]

This PR adds additional BubbleNips:

• topRight
• topLeft
• topCenter
• bottomRight
• bottomLeft
• bottomCenter

[fingerart]

Great! Can you add more supported scenarios? For example, it can be displayed at the top 30%, which is similar to Alignment . Some commonly used specific positions are preset, but users can also set any position they want through the constructor Alignment(0.5, 0).