ADBC support & contributions

[raayu83]

Hello,

just wondering:
There seems to be drivers based on ADBC.

So is Connector-X probably providing features on top of it / is workin on a higher level?
How about adding some some info on the advantages for other tools to use connector x instead of directly integrating adbc support to the README.md?

Also, how hard would it be to add new ADBC-Drivers?
Would you accept any merge requests?
E.g. for adding this driver: https://github.com/marconae/exarrow-rs