Sender of the reaction is missing

[mehrdadmms]

Origin

@TjitsevdM noticed a mistake in the format in which the raw data is stored.
The data under reactions doesn't list the sender of the emoji

Goal

• Add the sender of the emoji when storing the raw data

How

• Update dbComm repo and change the schema based on the necessity
• Update dbComm tests
• Extract and store the information related to the senders of reactions
• Add the correct schema to readme