Integrate cdk-graph to Autogenerate Infrastructure Graph

[kornel-filep]

This is an optional nice-to-have issue.

https://aws.github.io/aws-pdk/developer_guides/cdk-graph/index.html

Integration with cdk-graph will allow us to generate a draw.io graph (or other) representing our infrastructure which dynamically responds to modifications in our AWS-CDK stack.

Acceptance Criteria:

1. cdk-graph is successfully integrated into the existing project architecture.
2. A dynamic draw.io graph of the project infrastructure can be automatically generated.
3. The graph can be easily accessed and viewed by team members (Upload a generated graph to the repo).
4. Document into the README.md how to generate a new graph on-demand.