Support for .NET Standard 2.0

[dyeam0]

Checklist

• I agree to the terms within the OpenFGA Code of Conduct.

Describe the problem you'd like to have solved

To increase compatibility across .NET applications, we want support for .NET Standard. This will allow backward compatibility with .NET Framework applications.

Microsoft announced .NET Framework 4.8 as the last major version of .NET Framework. They have stated:

.NET Framework will continue to be included with Windows, with no plans to remove it.

Reference: .NET Framework versions and dependencies.

Adding .NET Standard 2.0 will provide backward compatibility with .NET Framework 4.8 and compatibility with newer .NET implementations.

See .NET Standard versions table.

Describe the ideal solution

The FGA .NET SDK is updated to target .NET Standard 2.0.

Alternatives and current workarounds

There are no alternatives to support applications on .NET Framework.

References

References:

• .NET Framework versions and dependencies
• .NET Standard versions table

PR #104

Additional context

No response