Adding support for case insensitive action names

[giulianob]

I am working with an API which uses camel case OData action names but these are not found because the routing is case sensitive. For example, the following will not work:

// sample/ODataCustomizedSample/Models/EnumsEdmModel.cs:75
- var actionConfiguration = employee.Action("AddSkill");
+ var actionConfiguration = employee.Action("addSkill");

This fails because OperationRoutingConvension is case sensitive. Changing the following makes it work.

// src/Microsoft.AspNetCore.OData/Routing/Conventions/OperationRoutingConvention.cs:91
- IEnumerable<IEdmOperation> candidates = context.Model.SchemaElements.OfType<IEdmOperation>().Where(f => f.IsBound && f.Name == operationName);
+ IEnumerable<IEdmOperation> candidates = context.Model.SchemaElements.OfType<IEdmOperation>().Where(f => f.IsBound && string.Equals(f.Name, operationName, StringComparison.InvariantCultureIgnoreCase));

I have introduced the property EnableActionNameCaseInsensitive to optionally enable case insensitive action names.

[corranrogue9]

@giulianob , thanks for the contribution! Did you file an issue for this? I'm pretty happy with the change, but it looks like the update to the API is causing a test failure. Can you take a look at that?

[giulianob]

@corranrogue9 Updated the API definitions. Do you want me to create an issue? I ran into the issue and created the PR.

[xuzhg]

🕐

[giulianob]

@xuzhg I resolved all of your comments. Thanks for the review.