Added schema for health_info, reboot_cause on chassisStateDB and adde…

…d the link to pmon-test-plan (#1709)

* Added schema for reboot-cause and health-info chassisStateDB

* Fixed formatting

* Fixed formatting

* Added TestPlan link

* Did some cleanup

* Updated reboot-cause schema, system-health-info schema and removed the
module_type_switch based on the implementation PR review

* updated the system-health info schema

* Removed the get_health_info API and addressed a couple of minor comments

* Fixed reboot-cause reboot-cause history and the all option outputs

* Updated rev 0.4

* cleaned  NPU to DPU data port mapping

* dpu_id now ranges from 0

* Changed the test-plan link

* Added  a section for DPU dark mode

* Did a minor cleanup in 2.1.1

* replaced platform.json with hwsku.json file to represent the NPU-DPU
data port association

* platform.json is the right file for NPU-DPU port association

* Removed get_module_dpu_data_port API. Showed hwo the role in interfaces
config is used

* Addressed review comments

* Added reboot hld link and updated the dpu shutdown sequence as per that

* Addressed review comments

* Addressed a couple of review comments

* Addressed the default dpu mode all over

* Included dpu-reboot-seq diagram, updated the spec for reboot-sequence,
removed the ID cloum in "show system-health dpu DPU0", changed the DPU
admin_state default behavior, added the dpu_state transition update.

* updated reboot-cause section

* Addressed review comments

* Updated the reboot-cause cli section 3.4.1

* Updated the reboot-cause CLIs section and added the max history count in
multiple places to be clear. Called out the output of the new CLI
extensions on the DPUs.

* Addressed a few review comments

* Addressed a review comment