improve optional dependencies import

[Gioee]

Feature Request

Is your feature request related to a problem? Please describe.
Remove useless imports like the Buffer one here in certain environments. e.g. node doesn't need buffer import since it's already defined https://nodejs.org/api/buffer.html

Describe the solution you'd like
Use dynamic imports to improve efficiency of the driver.
Dependencies we can remove using dynamic imports:

• whatwg-url
• buffer