Migrating existing decorator taking options to `valueof`

[timotheeguerin]

Now that we have the value world we can consider migrating decorators that were using models as input to object values.

This would emit a deprecation notice to the user with a quick fix. Decorators in this category:

Compiler:

• @service

Http

• @header
• @query

OpenAPI

• @extension
• @info

Decorators that would need to take a breaking change

Json Schema

• @extension