Feature: implement asset linter

[ArnCarveris]

Is your feature request related to a problem? Please describe.
When you duplicated documents in asset file Unity can't always show proper fileID

Describe the solution you'd like
There should be error log with code location when document duplicated is detected, also other validation check can be added in future.

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Additional context
It happened after merge

[dunward]

The unity meta guid is controlled by Unity as far as I know.
I'll find to sync unity asset guid but this issue will be looks difficult.

[ArnCarveris]

Well it very nasty thing bc when you have not so big scene with 10k+ lines of yaml if very hard to detect duplicate, this --- !u!4 &<fileID> should be unique per prefab/scene. Also It should check if father or child fileID exists