Add Microsoft.Extensions.AI.Templates third party notices

[MackinnonBuck]

Adds a THIRD-PARTY-NOTICES.TXT file to the Microsoft.Extensions.AI.Templates NuGet package.

In addition to the JS dependencies directly included in the template, I've added notices for 3rd party .NET packages used by the template, even though the template doesn't directly include content from those packages. We can remove those if we don't think it's necessary to include them.

Fixes https://github.com/dotnet/ai-private-planning/issues/259

Microsoft Reviewers: Open in CodeFlow

[dotnet-comment-bot]

‼️ Found issues ‼️

Project	Coverage Type	Expected	Actual
Microsoft.Extensions.AI	Line	89	88.54 🔻

🎉 Good job! The coverage increased 🎉
Update MinCodeCoverage in the project files.

Project	Expected	Actual
Microsoft.Extensions.Caching.Hybrid	82	87
Microsoft.Extensions.AI.Abstractions	82	83
Microsoft.Gen.MetadataExtractor	57	70

Full code coverage report: https://dev.azure.com/dnceng-public/public/_build/results?buildId=958459&view=codecoverage-tab

[SteveSandersonMS]

Looks great, thanks!

I don't know for sure whether we need to include copies of licenses for things we only consume via NuGet package references and don't redistribute ourselves. @jeffhandley do you know?

[jeffhandley]

I don't know for sure whether we need to include copies of licenses for things we only consume via NuGet package references and don't redistribute ourselves. @jeffhandley do you know?

I don't think so, since we're not distributing it. I'll double-check though.

[richlander]

It depends on the vantage point. It's hard to tell since this has something to do with templates.

In the normal case, we don't add 3PN entries for components we don't ship.

For templates, it would be useful to the user to have a 3PN file that reflects their app. That would include the packages.