feat: Add spec etc_sysconfig_pcs

[wushiqinlou]

All Pull Requests:

Check all that apply:

• [x] Have you followed the guidelines in our Contributing document, including the instructions about commit messages?
• [ ] Is this PR to correct an issue?
• [ ] Is this PR an enhancement?

Complete Description of Additions/Changes:

This spec is for new advisor rule

[xiangce]

@wushiqinlou - please get this spec being approved by opening an MR/issue to the assets repo first.