Add support to create connections using uri in SDK

[amoghrajesh]

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Was generative AI tooling used to co-author this PR?

• No

Why?

Happened to notice in https://github.com/apache/airflow/blob/main/providers/apache/livy/tests/unit/apache/livy/hooks/test_livy.py#L91 for example that it was allowed to create a connection in airflow 2.x with uri field. Although we have support for it now using from_uri this could mean that some DAGs from legacy base could fail due to this.

So I am intending to support constructing Connection from a URI now.

I had to use __attrs_post_init__ (to avoid attrs.define(init=False) and a custom __init__ to keep the class simple) to parse uri when provided and populate other fields: conn_type, host,
login, password, port, schema, and extra. This is because: uri is init-only and excluded from serialization (to_dict, from_json) matching the behaviour of models.connection.

---

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[amoghrajesh]

Some small adjustments needed to fix the CI

_______________________________________________________________________ TestConnectionFromUri.test_connection_constructor_with_uri _______________________________________________________________________
[gw1] linux -- Python 3.10.19 /usr/python/bin/python
task-sdk/tests/task_sdk/definitions/test_connection.py:382: in test_connection_constructor_with_uri
    conn = Connection(conn_id="test_conn", uri="**host:5432/db")
task-sdk/src/airflow/sdk/definitions/connection.py:153: in __init__
    self.__dict__.update(self.from_uri(uri, conn_id=conn_id).to_dict(validate=False))
E   AttributeError: 'Connection' object has no attribute '__dict__'. Did you mean: '__dir__'?

Looks like I need to set slots=False on the attrs constructor

[amoghrajesh]

LGTM but I cannot approve my own PR haha!

[uranusjr]

One line to remove