Add support for new credential management API, schema 48

[AlCalzone]

Adds support for the new access-control / credential-management API introduced in Z-Wave JS 15.23.4 and exposed via Z-Wave JS Server schema 48 (zwave-js-server v3.8.0).

Bumps MAX_SERVER_SCHEMA_VERSION to 48 and adds:

• AccessControlAPI wrapper on Endpoint / Node with all schema-48 commands (users, credentials, admin code, credential learn)
• Dataclasses + DataType TypedDicts for UserData, CredentialData, capabilities, event args
• Enums in const.command_class.access_control: UserCredentialType, UserCredentialUserType, UserCredentialRule, UserCredentialLearnStatus, SetUserResult, SetCredentialResult, AssignCredentialResult
• Node/endpoint event models: user added/modified/deleted, credential added/modified/deleted, credential learn progress/completed
• Buffer helpers (bytes_to_buffer_object / buffer_object_to_bytes) for credential payloads

Requires:

• zwave-js >= 15.23.4
• zwave-js-server >= 3.8.0

[MartinHjelmare]

This PR needs to wait for completion of schema 47 support.

[raman325]

What about the lock utility functions that HA uses? They should use these new methods under the hood

[MartinHjelmare]

Some to_dict methods are missing coverage in the new module.

[raman325]

what do we want to do about https://github.com/home-assistant-libs/zwave-js-server-python/blob/main/zwave_js_server/util/lock.py ? The HA services are currently dependent on these functions and I don't think the lib should have two separate paths for this functionality.

Maybe we just remove it entirely and make the change as part of the dependency bump?

[MartinHjelmare]

If we don't need those utils anymore we can remove them and make a breaking change.

[AlCalzone]

Only the code related ones though, not the lock configuration.
I can remove them if y'all think we should do this as part of this PR.

[MartinHjelmare]

No, we should not expand the scope of this PR.

[MartinHjelmare]

Thanks!