Add service for deployment frequency forecasting
What does this MR do and why?
This is part 1 MR of corresponding issue. It adds service layer to create forecasts for deployment frequency. It will be used in GraphQL API in the part 2 MR. No user facing changes yet.
Database review information
https://postgres.ai/console/gitlab/gitlab-production-tunnel-pg12/sessions/18588/commands/61670
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Related to #409871
Edited by Pavel Shutsin