refactor: compatibility policy for configuration files #2822
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Compatibility Policy for Configuration Files
Deny unknown configuration items.
To avoid several kinds of mistakes, for example, typos.
Allow deprecated configuration items, but they will be ignored; and warning messages will be output.
After several versions, if these deprecated items satisfied any of the following conditions, they will be fully removed (denied):
The default configuration files will not include any deprecated configuration items.
The default configuration files will not enable any experimental configuration items.