Emitter framework: Allow reference context to be passed to emitTypeReference

[timotheeguerin]

Current way of setting reference context is flawed in that you cannot have a different context to different reference. It is also run before the element itself instead of before emitting the reference so this mean the context would apply to the referrer as well.

This allows the emitTypeReference to take a parameter to patch the reference context

Next step would be to reconsider the *ReferenceContext and *Context methods to make more sense.

[github-actions]

Changes in this PR will be published to the following url to try(check status of TypeSpec Pull Request Try It pipeline for publish status):
Playground: https://cadlplayground.z22.web.core.windows.net/prs/2712/

Website: https://tspwebsitepr.z22.web.core.windows.net/prs/2712/

[bterlson]

Overall fine with the approach, but I think "patch" isn't a needed qualifier here - it's just plain reference context, set for any references from that point.

[timotheeguerin]

Overall fine with the approach, but I think "patch" isn't a needed qualifier here - it's just plain reference context, set for any references from that point.

that's fair I'll rename