CTHUB - track changes

**Describe the task**
Implement the track changes functionality.

**Purpose**
This is a requirement

**Acceptance Criteria**

We currently read and parse the ICBC file in chunks in order to avoid memory issues; this will have to change since the track changes functionality requires us to load 2 ICBC files completely into memory in order to compare them.

Try doing so; if it works, see how much memory it takes so we can request the appropriate amount from the platform services teams.