Fix/add device key to auth params if set

[NodeJSmith]

While AWSSRP was updated in a previous PR to handle device authentication support, the Cognito class and the RequestsSrpAuth class were not. This left pycognito stating that it supported this while being unable to deliver on that support.

This PR fixes this:

• adds the four device metadata values to the init method of both classes
• handles adding the DEVICE_KEY to the auth params during authentication, if self.device_key is set
• handles confirming the device and setting values on Cognito instance when NewDeviceMetadata key is included in authentication response

Closes #133

[Copilot]

Pull Request Overview

This PR adds support for device authentication metadata throughout the library, ensuring that device keys and related parameters are properly accepted, sent in authentication requests, and handled on responses.

• Extended constructors in both RequestsSrpAuth (utils.py) and Cognito (__init__.py) to accept device_key, device_group_key, device_password, and device_name.
• Updated authenticate and renew_access_token in Cognito to include DEVICE_KEY in auth parameters when present.
• Handled NewDeviceMetadata in both _set_tokens and post-auth flows to confirm devices and store returned metadata.

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
pycognito/utils.py	Added device metadata parameters to RequestsSrpAuth init and AWSSRP call
pycognito/init.py	Updated Cognito init, authenticate, renew_access_token, and _set_tokens to handle device metadata

Comments suppressed due to low confidence (2)

pycognito/init.py:732

• Consider adding unit tests for the refresh flow to verify that DEVICE_KEY is included in AuthParameters when device_key is set, and that no device confirmation is triggered when device_key is absent.

        if self.device_key is not None:

pycognito/init.py:732

• [nitpick] The logic to inject DEVICE_KEY into auth parameters is duplicated between authenticate and renew_access_token. Extract this into a shared helper to reduce duplication and improve maintainability.

        if self.device_key is not None:

[NodeJSmith]

@ludeeus Would you be the right person to ping for a review of this PR? No rush, but want to make sure someone is aware of it.

[ludeeus]

I have asked around internally, will keep you posted.