Implement Hlt1 filter

Nicole Skidmorerequested to merge
hlt1filter into master

Adressing https://gitlab.cern.ch/lhcb-dpa/project/-/issues/150

Implement HLT1 filter for HLT2 and Sprucing lines with unit tests

See related Allen issue

Now uses ThoR functors to do Hlt decision line filtering, including filtering for the streaming

To do

Edited by Nicole Skidmore

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