add huawei_vrp platform

[yanpla]

This PR adds the huawei_vrpv8 platform.

Tests pass,
other huawei versions might also work with this but I chose huawei_vrpv8 naming as it's also used in Netmiko

[Copilot]

Pull request overview

This PR introduces a new Huawei VRPv8 platform to the hier_config platform/driver system, enabling correct negation behavior (undo ...), comment stripping, and Huawei-style sectional exiting (quit) when generating remediation configs.

Changes:

• Added Platform.HUAWEI_VRPV8 and wired it into driver construction and v2→v3 platform mapping.
• Implemented a new HConfigDriverHuaweiVrpv8 with Huawei-specific negation and quit sectional exits.
• Added a dedicated Huawei VRPv8 driver test suite and refactored sectional exit logic to be driver-overridable.

Reviewed changes

Copilot reviewed 7 out of 8 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
tests/test_driver_huawei_vrpv8.py	Adds tests covering Huawei VRPv8 negation behavior, comment stripping, and quit sectional exits.
hier_config/utils.py	Extends v2→v3 platform string mapping to include huawei_vrpv8.
hier_config/platforms/huawei_vrpv8/driver.py	New Huawei VRPv8 driver implementing undo negation rules and quit sectional exiting.
hier_config/platforms/huawei_vrpv8/init.py	Adds package marker for the new platform module.
hier_config/platforms/driver_base.py	Centralizes sectional-exit computation on the driver to support platform overrides.
hier_config/models.py	Adds the HUAWEI_VRPV8 platform enum value.
hier_config/constructors.py	Registers the new platform driver in get_hconfig_driver.
hier_config/child.py	Delegates sectional-exit computation to driver.sectional_exit().

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[jtdub]

Hi @yanpla. Thank you for the contribution! I've made a couple of suggestions.

[jtdub]

LGTM! Thanks!