[pack] adding AspNetCore Grpc implementation

[brettsam]

This is a revitalization of #6842, hiding the implementation behind a feature flag.

Update -- this is no longer hidden behind a feature flag, but you can use a feature flag to disable and go back to the old Grpc server implementation.

[brettsam]

Capturing the deps.json failure here so I can comment:

IMPORTANT: The dependencies in WebHost have changed and MUST be reviewed before proceeding. Please follow up with brettsam, fabiocav or mathewc for approval.

Previous file: D:\a\1\s\test\WebJobs.Script.Tests\bin\Debug\netcoreapp3.1\Microsoft.Azure.WebJobs.Script.WebHost.deps.json
New file:      D:\a\1\s\src\WebJobs.Script.WebHost\bin\Debug\netcoreapp3.1\Microsoft.Azure.WebJobs.Script.WebHost.deps.json

Changed:
- Google.Protobuf.dll: 3.11.4.0/3.11.4.0 -> 3.13.0.0/3.13.0.0

Removed:
- Grpc.Core.Api.dll: 2.0.0.0/2.27.0.0
- Grpc.Core.dll: 2.0.0.0/2.27.0.0

Added:
- Grpc.AspNetCore.Server.ClientFactory.dll: 2.0.0.0/2.32.0.0
- Grpc.AspNetCore.Server.dll: 2.0.0.0/2.32.0.0
- Grpc.Core.Api.dll: 2.0.0.0/2.32.0.0
- Grpc.Core.dll: 2.0.0.0/2.32.0.0
- Grpc.Net.Client.dll: 2.0.0.0/2.32.0.0
- Grpc.Net.ClientFactory.dll: 2.0.0.0/2.32.0.0
- Grpc.Net.Common.dll: 2.0.0.0/2.32.0.0
- Microsoft.Extensions.Configuration.Abstractions.dll: 3.1.9.0/3.100.920.47302
- Microsoft.Extensions.Configuration.Binder.dll: 3.1.9.0/3.100.920.47302
- Microsoft.Extensions.Configuration.dll: 3.1.9.0/3.100.920.47302
- Microsoft.Extensions.DependencyInjection.Abstractions.dll: 3.1.9.0/3.100.920.47302
- Microsoft.Extensions.DependencyInjection.dll: 3.1.9.0/3.100.920.47302
- Microsoft.Extensions.Logging.Abstractions.dll: 3.1.9.0/3.100.920.47302
- Microsoft.Extensions.Logging.dll: 3.1.9.0/3.100.920.47302
- Microsoft.Extensions.Options.dll: 3.1.9.0/3.100.920.47302
- Microsoft.Extensions.Primitives.dll: 3.1.9.0/3.100.920.47302

[brettsam]

First, the easy ones:

These are all used already because we run on the 3.1 framework. I confirmed in a running app already.

- Microsoft.Extensions.Configuration.Abstractions.dll: 3.1.9.0/3.100.920.47302
- Microsoft.Extensions.Configuration.Binder.dll: 3.1.9.0/3.100.920.47302
- Microsoft.Extensions.Configuration.dll: 3.1.9.0/3.100.920.47302
- Microsoft.Extensions.DependencyInjection.Abstractions.dll: 3.1.9.0/3.100.920.47302
- Microsoft.Extensions.DependencyInjection.dll: 3.1.9.0/3.100.920.47302
- Microsoft.Extensions.Logging.Abstractions.dll: 3.1.9.0/3.100.920.47302
- Microsoft.Extensions.Logging.dll: 3.1.9.0/3.100.920.47302
- Microsoft.Extensions.Options.dll: 3.1.9.0/3.100.920.47302
- Microsoft.Extensions.Primitives.dll: 3.1.9.0/3.100.920.47302

These are minor version updates (I'm trying to figure out why some of these are listed as Removed/Added rather than Changed):

Changed:
- Google.Protobuf.dll: 3.11.4.0/3.11.4.0 -> 3.13.0.0/3.13.0.0

Removed:
- Grpc.Core.Api.dll: 2.0.0.0/2.27.0.0
- Grpc.Core.dll: 2.0.0.0/2.27.0.0

Added:
...
- Grpc.Core.Api.dll: 2.0.0.0/2.32.0.0
- Grpc.Core.dll: 2.0.0.0/2.32.0.0

I think we should explicitly list these as Private just in case anyone happens to be using them in prod:

Added:
- Grpc.AspNetCore.Server.ClientFactory.dll: 2.0.0.0/2.32.0.0
- Grpc.AspNetCore.Server.dll: 2.0.0.0/2.32.0.0
...
- Grpc.Net.Client.dll: 2.0.0.0/2.32.0.0
- Grpc.Net.ClientFactory.dll: 2.0.0.0/2.32.0.0
- Grpc.Net.Common.dll: 2.0.0.0/2.32.0.0

[pragnagopa]

Tagging @Francisco-Gamino as FYI - need to keep a close on E2E integration test results after this PR is merged - to ensure we do not see any issues across language workers

[pragnagopa]

💯

cc @balag0 - fyi

[pragnagopa]

tagging @vrdmr - for python language worker , @amamounelsayed - for language worker , @alrod - for node language worker , @AnatoliB / @Francisco-Gamino - powershell language worker

FYI - please keep a close eye on the logs as this commit starts rolling out

[Francisco-Gamino]

Tagging @Francisco-Gamino as FYI - need to keep a close on E2E integration test results after this PR is merged - to ensure we do not see any issues across language workers

@pragnagopa -- Ack. Will do.