AB#724 Refactor mapLayerStore into react context

[hjvuor]

Proposed Changes

• Refcators into react context with a provider and a custom hook that returns the layers and a update function

Pull Request Check List

• A reasonable set of unit tests is included
• Console does not show new warnings/errors
• Changes are documented or they are self explanatory
• This pull request does not have any merge conflicts
• All existing tests pass in CI build

Review

• Read and verify the code changes
• Test the functionality by running the UI locally with all popular browsers available in your platform
• Check that the implementation matches the design, when such one is defined in an issue in Azure Boards
• Merge the pull request

[vesameskanen]

layer locking still needs some tuning:

• citybikes near you shows 'vehicles' checked which is misleading. Locking is OK.
• citybike, bike park and car park pages also show 'vehicles' checked. Locking is OK.
• route page should lock and force disable car and bike parks