chore: enable public API compat validation

[jmaeagle99]

What was changed

• Add public API compat validation to validate with baseline version and across TFMs within the same build.
• Added compat suppression for intentional differences between TFMs within the same build.

Example dotnet pack error when compat has changed:

/usr/local/share/dotnet/sdk/10.0.200/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.ApiCompat.ValidatePackage.targets(39,5): error API compatibility errors between 'lib/net462/Temporalio.dll' (/Users/justin/.nuget/packages/temporalio/1.14.0/temporalio.1.14.0.nupkg) and 'lib/net462/Temporalio.dll':
    /usr/local/share/dotnet/sdk/10.0.200/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.ApiCompat.ValidatePackage.targets(39,5): error CP0002: Member 'System.Threading.Tasks.Task Temporalio.Client.ActivityHandle.GetResultAsync(Temporalio.Client.RpcOptions?)' exists on [Baseline] lib/net462/Temporalio.dll but not on lib/net462/Temporalio.dll
    /usr/local/share/dotnet/sdk/10.0.200/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.ApiCompat.ValidatePackage.targets(39,5): error CP0002: Member 'System.Threading.Tasks.Task<TResult> Temporalio.Client.ActivityHandle<TResult>.GetResultAsync(Temporalio.Client.RpcOptions?)' exists on [Baseline] lib/net462/Temporalio.dll but not on lib/net462/Temporalio.dll

Why?

• Make it easier to check API compatibility compared to a baseline version of the package. Chose the latest version as the baseline.

Checklist

1. How was this tested: CI and local build
2. Any docs updates needed? No

[Sushisource]

Cool