feat(profiles): Support profiler_id in context

[phacops]

As part of continuous profiling, we need to store a profiler_id on the profile context of a transaction.

[Dav1dde]

This won't work, the context is recreated in transfer_id:

relay/relay-server/src/services/processor/profile.rs

Lines 66 to 87 in bdb89f2

	pub fn transfer_id(
	state: &mut ProcessEnvelopeState<TransactionGroup>,
	profile_id: Option<ProfileId>,
	) {
	let Some(event) = state.event.value_mut() else {
	return;
	};
	match profile_id {
	Some(profile_id) => {
	let contexts = event.contexts.get_or_insert_with(Contexts::new);
	contexts.add(ProfileContext {
	profile_id: Annotated::new(profile_id),
	});
	}
	None => {
	if let Some(contexts) = event.contexts.value_mut() {
	contexts.remove::<ProfileContext>();
	}
	}
	}
	}

[Zylphrex]

LGTM

[Dav1dde]

Please move the thread id/name changes to a separate PR