Added in preview 1 release notes (dotnet#7400)

Added 4.0.2 release notes (dotnet#7399)

Adding 4.0.1 servicing notes (dotnet#7365)

* adding 4.0.1 servicing notes

* adding missed pr

* reworded line

Update package versions in use by ML.NET tests (dotnet#7055)

Will backport this to the 3.0 branch too.

This also updates Newtonsoft which is a product dependency - but only
updates to the latest servicing release which we can do as a servicing
release ourselves.

added in release notes for 3.0.1 (dotnet#6963)

Co-authored-by: Michael Sharp <misharp@microsoft.com>

Release notes for 3.0 (dotnet#6888)

* release notes 3.0

* Apply suggestions from code review

Co-authored-by: Jeff Handley <jeffhandley@users.noreply.github.com>

* updates from pr

---------

Co-authored-by: Jeff Handley <jeffhandley@users.noreply.github.com>

Adds the ability to load a pre-trained LightGBM file and import it in…

…to ML.Net. (dotnet#6569)

* need to finish multiclass

* multiclass

* reverting test for now

* reverting test for now

* added test and fixed objective parsing

* minor testing changes

Cherry picking PR that fixes official build. (dotnet#6468)

Merging since it has already been validated in the official build and is already in main.

Update versioning to 1.7.1 / 0.19.1 (dotnet#6122)

Update versioning to 1.7.1 / 0.19.1 (dotnet#6122)