Splitting event name into own column on decode

[GarrettJMU]

(unsure if this is the right place)

It'd be great to split out the event name from the event_signature. Could create a new column, event_name so end users don't have to split on ( to parse out the name.

[jeffling]

Hey! good callout - we could do this in the next version, though I am concerned that adding a column may push the overall dataset size up.

I'll give this a try with goldsky mirror for a block range and see what the size increase is, and report back :)