[feature] Wrap Link with forwardRef

[avionbg]

There are cases where we need a working ref to rendered link dom node, it would really be helpful if this gets into the code.

[cbbfcd]

hi~, can you tell me what the scene is? maybe there are some workarounds.

[avionbg]

Most typical example would be MUI <Button component={Link} /> - which fails due to the missing ref.

[trymoto]

Same here, would be useful with MUI

[trymoto]

@cbbfcd I can go ahead and create a pr if it's ok, should be pretty straightforward.

[molefrog]

This has been implemented and released in https://github.com/molefrog/wouter/releases/tag/v2.8.0

Thanks @trymoto for your help!