[Celestica] Leh800bcls:Platform:Add first draft version of platform_manager config file

[wuchao-tech]

Pre-submission checklist

• I've ran the linters locally and fixed lint errors related to the files I modified in this PR. You can install the linters by running pip install -r requirements-dev.txt && pre-commit install
• pre-commit run

clang-format.........................................(no files to check)Skipped
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trim trailing whitespace.................................................Passed
fix end of files.........................................................Passed
check yaml...........................................(no files to check)Skipped
check json...............................................................Passed
check for merge conflicts................................................Passed
ruff check...........................................(no files to check)Skipped

Summary

1. Change Platform Manager Config File To Support New Platform Leh800bcls
2. Modify Platform Thrift File To Support New FRU 'PDU'

Test Plan

Due to there is no hardware platform yet, pass the compile for validation the config file format

compile_log.txt

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Thank you for signing our Contributor License Agreement. We can now accept your code for this (and any) Meta Open Source project. Thanks!