Add a telemetry event on connect/disconnect · elixir-ecto/db_connection@4021475

test send `:connected` message after connected with `after_connect` function (ConnectionListenersTest)

test send `:connected` message after each connection in pool has connected (ConnectionListenersTest)

test send `:disconnected` message after disconnect (ConnectionListenersTest)

test send `:connected` message after disconnect then reconnected (ConnectionListenersTest)

test send `:disconnected` message with tag after disconnect (ConnectionListenersTest)

test send `:connected` message after connected (ConnectionListenersTest)

test send `:connected` message with tag after connected (ConnectionListenersTest)

test send `:disconnected` message with tag after disconnect (ConnectionListenersTest)

test send `:connected` message after connected with `after_connect` function (ConnectionListenersTest)

test send `:disconnected` message after disconnect (ConnectionListenersTest)

Node.js 16 actions are deprecated. Please update the following actions to use Node.js 20: actions/checkout@v2. For more information see: https://github.blog/changelog/2023-09-22-github-actions-transitioning-from-node-16-to-node-20/.

The following actions uses node12 which is deprecated and will be forced to run on node16: actions/checkout@v2. For more info: https://github.blog/changelog/2023-06-13-github-actions-all-actions-will-run-on-node16-instead-of-node12-by-default/

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