Adds new ISiloBuilder extension method

[Kritner]

Description

Adds new ISiloBuilder extension method that can be used with the UseOrleans extension method on top of IHostBuilder

• https://docs.microsoft.com/en-us/dotnet/api/microsoft.extensions.hosting.ihostbuilder?view=dotnet-plat-ext-6.0

Fixes #33

Type of Change

• Bug fix
• New Feature
• Documentation
• Code improvement
• Breaking change - if a public API changes, or any change that DOES or MAY require a major revision to the NuGet package version due to semver.
• Unit tests
• Code samples
• Added your repository URL to the readme because you make use of this super cool package! ;)
• Other

Describe testing that was performed for your change

Added new unit tests mirroring the tests against ISiloHostBuilders extension methods

Checklist

• Read the https://github.com/OrleansContrib/Orleans.SyncWork/blob/main/CONTRIBUTING.md
• Ran unit tests and ensured they passed
• Added unit tests where applicable
• Referenced an issue where applicable
• Ran dotnet-format locally