Added a new column representing accumulative gc pause %

[MokoSan]

• Added a new column representing accumulative gc pause % computed as: Cumulative Sum(TraceGC.PauseDurationMSec) / Total Elapsed Time From The Start of Monitoring * 100%.
• Updated the ColumnInfoMap to now take in a CapturedGCEvent rather than a TraceGC that'll help with more customizable calculations that aren't constrained to just TraceGC.
• Added the new column to the DefaultConfig.yaml.

The addition of the new column with the DefaultConfig.yaml is: