Added GraphQL.Client 1.0.0

[IvanMurzak]

The NuGet package needs to respect a few constraints in order to be listed in the curated list:

• Add a link to the NuGet package: https://www.nuget.org/packages/GraphQL.Client
• It must have non-preview versions (e.g 1.0.0 but not 1.0.0-preview.1)
• It must provide .NETStandard2.0 assemblies as part of its package
• The lowest version added must be the lowest .NETStandard2.0 version available
• The package has been tested with the Unity editor
• The package has been tested with a Unity standalone player
  • if the package is not compatible with standalone player, please add a comment to a Known issues section to the top level readme.md
• All package dependencies with .NETStandard 2.0 target must be added to the PR (respecting the same rules above)
  • Note that if a future version of the package adds a new dependency, this dependency will have to be added manually as well

Note: The server will be updated only when a new version tag is pushed on the main branch, not necessarily after merging this pull-request.

[IvanMurzak]

The package `GraphQL.Client.Serializer.Newtonsoft.3.1.8` has a dependency on `Panic.StringUtils` which is not in the registry. You must add this dependency to the registry.json file.

That is the only one version 3.1.8 across all other versions that has the dependency on Panic.StringUtils. Can we ignore the GraphQL.Client.Serializer.Newtonsoft.3.1.8 but still include rest of versions? I would love to include Panic.StringUtils but it doesn't support .netstandard2.0 or 2.1.

[bdovaz]

Change the version to 3.1.9 and add an exception here with the reason:

UnityNuGet/src/UnityNuGet.Tests/RegistryTests.cs

Line 109 in d02388b

var excludedPackages = new string[] {