AS a moderator, I want the member logs to have their dates as an age rather than just a date
SO THAT I can see how old the account is more easily

Acceptance Criteria

AS a moderator
GIVEN a new account joins/leaves the server
WHEN I look at the embed the bot sent in the logs
THEN I should see the age of their account/when they joined as well

Subtasks

• Add age to member add event embed
• Add age to member remove event embed
• Update tests