Update memberactivities analytics to platform agnostic

[amindadgar]

In order to make the discord-analyzer a general analyzer to be able to work for multiple platforms, we need to refactor the codes. This work can be done after the #74 as the input for memberactivities analytics is heatmaps analytics. The things that needs to be updated for memberactivites are

• Accept analyzer config to know which information for heatmaps to use for the input of memberactivities analytics.
• Generate interaction matrixes for the knowledge we have on heatmaps
• Update the generated graph to be platform agnostic. part of Refactor Neo4j graph analytics #77