refactor(pages-api): create layout service to handle more explicit layout actions

[Jondyr]

Description

Creates a new service LayoutService that will be used for more fine
grained explicit operations on the layout configurations.
Adds basic operations for pages in a layout.

---

Stack:

• refactor(pages-api): implement new page re-ordering on frontend #14717
• refactor(pages-api): new backend endpoint for changing page order #14716
• refactor(pages-api): add mediatr sync events and cache invalidation #14709
• refactor(pages-api): implement page api on frontend #14694
• refactor(pages-api): create api endpoints for layout actions based on new layout service #14685
• refactor(pages-api): create layout service to handle more explicit layout actions #14684 ⬅
• refactor(pages-api): change parameter for layout operations to just use layout name #14683

⚠️ Part of a stack created by spr. Do not merge manually using the UI - doing so may have unexpected results.

Related Issue(s)

• Create CRUD endpoints for pages/groups #14582

Verification

• Your code builds clean without any errors or warnings
• Manual testing done (required)
• Relevant automated test added (if you find this hard, leave it and we'll help out)

Documentation

• User documentation is updated with a separate linked PR in altinn-studio-docs. (if applicable)

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[lassopicasso]

LGTM! I only have two optional suggestions/questions.

[lassopicasso]

🚀

[mlqn]

Tested OK, nice work! 🚀