chore: migrate odata v3 service to core

[gyankov]

Related to: telerik/kendo/issues/17327.

[Dimitar-Goshev]

The new services are built with dotnet publish -c release --self-contained true --arch x86 and deployed to IIS for testing.
Issues in odata v3 core when hitting the respective endpoint:

• StockData -

System.InvalidOperationException: The LINQ expression 'DbSet<Intraday>()
    .Where(s => s.Date >= __dateFrom_0 && s.Date <= __dateTo_1)
    .GroupBy(s => new { 
        Year = s.Date.Year, 
        Month = s.Date.Month, 
        Day = 1, 
        Hour = 0, 
        Minute = 0
     })
    .Select(g => g)' could not be translated. Additional information: Translation of 'Select' which contains grouping parameter without composition is not supported. Either rewrite the query in a form that can be translated, or switch to client evaluation explicitly by inserting a call to 'AsEnumerable', 'AsAsyncEnumerable', 'ToList', or 'ToListAsync'.

• Tasks (Scheduler Basic usage demo)

ActionName: KendoCRUDService.Controllers.TasksController.Index (KendoCRUDService)

An exception occurred while iterating over the results of a query for context type 'KendoCRUDService.Data.DemoDbContext'.
System.InvalidOperationException: The data is NULL at ordinal 3. This method can't be called on NULL values. Check using IsDBNull before calling.

• Meetings (Scheduler Keyboard navigation demo)

ActionName: KendoCRUDService.Controllers.MeetingsController.Index (KendoCRUDService)

An exception occurred while iterating over the results of a query for context type 'KendoCRUDService.Data.DemoDbContext'.
System.InvalidOperationException: The data is NULL at ordinal 3. This method can't be called on NULL values. Check using IsDBNull before calling.

Issues in odata v4 core:

• Grid odata v4 demo - The current version on Live demo https://demos.telerik.com/kendo-ui/grid/odatav4 returns @odata.context, @odata.count and value array . The core version returns just the content of the value array and the Grid does not display data.
• TreeList odata v4 demo - The current version on Live demo https://demos.telerik.com/kendo-ui/treelist/odata returns @odata.context and value array with the root item. The core version returns just the content of the value array and the TreeList does not display data.