[RUM 11204] [Modularization] Remove type dependencies between modules

[sbarrio]

What does this PR do?

This PR removes module interdependencies (e.g between Logs and RUM) by moving shared type definitions up to the core module, instead of bringing them from a specific module in particular. This way modules are independent from each other and can potentially be used on their own.

Motivation

This is part of the modularization effort that will be part of v3.

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests
• Make sure you discussed the feature or bugfix with the maintaining team in an Issue
• Make sure each commit and the PR mention the Issue number (cf the CONTRIBUTING doc)
• If this PR is auto-generated, please make sure also to manually update the code related to the change