multi: add `platform` directory, add `MapScalebar` params, add more tests

[josxha]

• use 3.24.0 in matrix ci workflows
• add more tests
• move web to platform/web
• move native to platform/android
• always use black color for event logs on event example page
• rename CI [Android] Unit tests to Unit tests
• remove cached hashCodes from annotation layers as they where not used
• add `MapScalebar´ parameters for padding and alignment

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