cubicweb-brainomics #4084898 Add an access point to add additional data for subjects in timeline [validation pending]

prioritynormal
typebug
done in0.11.2
load0.100
load left0.000
closed by#09ff6e30593a [timeline] Add an access point to add additional data for subjects in timeline, closes #4084898
patch[timeline] Add an access point to add additional data for subjects in timeline, closes #4084898 [applied]