Adding context_id support to selectors

[BobaFetters]

Adding support for supplying context_id through selectors

Addresses GRAPHOS-67

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[aaronArinder]

do we also want context IDs to be selectable from connectors?

[carodewig]

Overall looks good! A few comments / style suggestions below but the approach makes sense to me

[carodewig]

I don't quite follow this - I would think the lack of a selector was what was preventing the use of the context ID in telemetry?

[carodewig]

Final nitpick / style suggestion but otherwise LGTM!

[carodewig]

LGTM!

[sachindshinde]

Codeowners-wise our team only owns apollo-router/src/plugins/connectors/handle_responses.rs, and those changes and adjacent changes seem fine to me (looks like it's cloning the context on through to the response for telemetry selection, and the context seems cheap enough to clone). If there's something specific you want us to review, let us know and we can give it a look!