Grouping of connections

### Description Have an additional field called "Connection Group" within the connections form to place a set of connections under a specific grouping. ### Use case/motivation Our company uses airflow amongst a few different teams and the databases we interact with are decentralized. For a single DAG, we can have 25-50 connections. Often times finding all the connections that pertain the particular DAG can be difficult. We would like to assign connections to a group. This way we could easily search and filter by this group. ### Related issues _No response_ ### Are you willing to submit a PR? - [X] Yes I am willing to submit a PR! ### Code of Conduct - [X] I agree to follow this project's [Code of Conduct](https://github.com/apache/airflow/blob/main/CODE_OF_CONDUCT.md)