Add a schema of autorest configuration to schemastore.org

[davidyuk]

Is your feature request related to a problem? Please describe.
I may do a typo in the autorest configuration file and if I had the schema set up then my IDE would warn me before running autorest. Also, the schema would help to investigate available options without looking in the docs.

Describe the solution you'd like
To add a schema to https://schemastore.org/ matching files autorest.(yaml|json), and maybe *.autorest.(yaml|json). So, the extension I'm using would automatically pick up that schema.

Describe alternatives you've considered
If I had that schema just published somewhere, I would add a comment like

# yaml-language-server: $schema=<urlToTheSchema>

to enable validation without using schemastore.

Additional context
By configuration I mean the format mentioned in https://github.com/Azure/autorest/blob/main/docs/generate/readme.md