[FEATURE] GCP data integration

[robin-castellon]

Is your feature request related to a problem? Please describe.
Carmen is currently able to parse Azure data only.

Describe the solution you'd like
Implement GCP data parsing, along with GCP constants.

Eg. of constants to be updated for GCP:
https://github.com/AmadeusITGroup/carmen/blob/main/backend/src/common/constants.py#L74

Eg. of class to be adapted for GCP:
https://github.com/AmadeusITGroup/carmen/blob/main/backend/src/daemon/readers/compute/azure_compute_reader.py

The data sources for the constants should be the same or similar to the ones already used.