chore: add groups for dependabot

Merge pull request #680 from Cysharp/ci/nuget_release

ci: add id-token: write for NuGet Trusted Publish

Merge pull request #679 from Cysharp/feature/nuget

chore: Specify IsPackable=false on Directory.Build.props, explicitly true for target packages.

Merge pull request #677 from Cysharp/feature/docs

chore: exclude tests assemblies

ci: change docfx target from source code to Unity built assemblies

ci: replace docfx build from container to docfx command

ci: dependabot cooldown 65d2ae

Merge pull request #672 from Cysharp/ci/nuget_readme

ci: add dotnet pack and use Release

chore: add README.md to nuget package

ci: missing permission

ci: fix ghalint