Add a selection id for Sprucing

Shunan Zhangrequested to merge
spruce_selection_id into master

Add a spruce_selection_id to use different SelectionID from HLT. Used already in !943 (merged).

Related to lhcb-dpa/project#133.

Needs LHCb!3168 (merged).

cc @nskidmor

Edited by Eduardo Rodrigues

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