Add billing module for GitLab monolith

Michał Wielichrequested to merge
mw-billing-events-client into master

What does this MR do and why?

Add billing module for GitLab monolith. The new class is build similarly to e.g. Python's implementation: https://gitlab.com/gitlab-org/modelops/applied-ml/code-suggestions/ai-assist/-/blob/main/docs/billing_events.md?ref_type=heads

Related to https://gitlab.com/gitlab-org/gitlab/-/work_items/602563

References

Screenshots or screen recordings

Before After

How to set up and validate locally

Follow instructions from the MR diff to trigger billing events locally.

MR acceptance checklist

Evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Edited by Michał Wielich

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