nuget CPM support

[WeihanLi]

Proposed Changes

Use the nuget CPM feature to manage the nuget package versions centrally

https://learn.microsoft.com/en-us/nuget/consume-packages/central-package-management

Types of Changes

What types of changes does your code introduce to this project?
Put an x in the boxes that apply

• Bug fix (non-breaking change which fixes issue #NNNN)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause an observable behavior change in existing systems)
• Documentation improvements (corrections, new content, etc)
• Cosmetic change (whitespace, formatting, etc)

Checklist

Put an x in the boxes that apply. You can also fill these out after creating
the PR. If you're unsure about any of them, don't hesitate to ask on the
mailing list. We're here to help! This is simply a reminder of what we are
going to look for before merging your code.

• I have read the CONTRIBUTING.md document
• I have signed the CA (see https://cla.pivotal.io/sign/rabbitmq)
• All tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)
• Any dependent changes have been merged and published in related repositories

[WeihanLi]

submodule project needs to be updated also
rabbitmq/toxiproxy-netcore#1

[lukebakken]

@WeihanLi whatever text editor you are using is removing the UTF-8 BOM from these files, and creating an unnecessary change. Please revert.

[WeihanLi]

@lukebakken thanks very much for help, I did not notice this before

[lukebakken]

@WeihanLi whatever text editor you are using is removing the UTF-8 BOM from these files, and creating an unnecessary change. Please revert.

[lukebakken]

@WeihanLi whatever text editor you are using is removing the UTF-8 BOM from these files, and creating an unnecessary change. Please revert.

[lukebakken]

Thank you!

[WeihanLi]

thanks for help