Extracted model-related methods to intMapPoiCategoriesModel.js, added new unit test
Fixed extendPoiCategoryData test and created findPoiCategoryById test
Test for setPoiCategoryUpdatedData
Test for isPoiCategoryDeleted
Fix methods order
Fix methods order
Test for organizePoiCategories
Additional test case for organizePoiCategories
Refactored some methods
Test for getPoiCategoryUpdated
Test for updatePoiCategoriesData