MiniSeedInputClient should start a new block at UTC midnight

Because of how Edge stores data, blocks should not span UTC midnight.

• The input client should check trace start/endtime to make sure data does not span midnight
• If data span midnight, the client should split the trace at UTC midnight (so each block only contains data occurring on one UTC day) and write each block separately.

mentioned in merge request !82 (merged)

marked the checklist item The input client should check trace start/endtime to make sure data does not span midnight as completed

marked the checklist item If data span midnight, the client should split the trace at UTC midnight (so each block only contains data occurring on one UTC day) and write each block separately. as completed

closed with merge request !82 (merged)

mentioned in commit 3ba0c794

changed milestone to %Miniseed Pipeline