Attach target labels at scrape time

[fabxc]

Currently we are wrapping appends to attach target labels – so right before insertion into the storage. That causes us to first allocate label sets when we first see the target and then creating new label sets, which causes memory spikes when many targets appear at once.

If we can pull that logic deeper in, we can directly build the correct label set.
Slightly less nice abstraction, but probably worth it.

[lock]

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