refactor: Centralize trait utilities

[allenporter]

This extracts the core trait listener and data converter mechanisms into a shared module to eliminate duplication and establish a cleaner base for upcoming protocol features. This will be used by the upcoming v1 streaming updates feature.

Pulled out from #799 as a separate PR

[Copilot]

Pull request overview

Refactors trait infrastructure by moving the trait update listener and DPS-to-dataclass conversion logic into a shared module, reducing duplication and preparing for upcoming protocol/streaming work.

Changes:

• Generalize DpsDataConverter and TraitUpdateListener into roborock/devices/traits/common.py.
• Update Q10 status trait to import shared utilities from the centralized module.
• Refresh module docstring to reflect broader “device traits” scope.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
roborock/devices/traits/common.py	Centralizes and generalizes trait utilities; updates docs and typing around DPS conversion.
roborock/devices/traits/b01/q10/status.py	Switches imports to use the new centralized trait utilities module.

Comments suppressed due to low confidence (2)

roborock/devices/traits/common.py:44

• TDps is currently declared as TypeVar(..., bound=int), but existing callers (e.g. B01 Q10) use B01_Q10_DP keys, which are RoborockModeEnum (a StrEnum), not int. This bound makes the shared converter’s type contract misleading and may block correct generic usage for enum-keyed DPS maps; consider widening the bound (e.g., to Hashable) or removing it so both int- and enum-keyed DPS dictionaries are supported.
  roborock/devices/traits/common.py:24
• The update-lifecycle docstring example says the transport layer decodes DPS into a dict like {"101": 80} (string keys), but for B01 Q10 the protocol layer converts DPS keys to B01_Q10_DP enums (see roborock/protocols/b01_q10_protocol.py). Consider rewording to reflect that decoded DPS keys are normalized (e.g., int for A01/B01-Q7, B01_Q10_DP for B01-Q10) so trait code knows what key type to expect.

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