Change event id to big int

[antunesleo]

Description

Change event id to big int, increasing the id limit from 2147483647 to 9223372036854775807

Motivation and Context

Current event id is a integer field, which has a max value of 2147483647. When events table reach such limit, all new inserts to the table will fail. This can cause a catastrophic failure. 2B itens is not so difficult to reach, if a application stores 1M messages per day, this limit will be reach in 5 years.

How has this been tested?

covered by current unit and integrations tests

What is the current behavior?

no changes on behavior

What is the new behavior?

no changes on behavior