Publishing SQL Core library in nuget (#2173)

* Set up CI with Azure Pipelines

[skip ci]

* Update publishSqlCoreProject.yml for Azure Pipelines

* Update publishSqlCoreProject.yml for Azure Pipelines

* Update publishSqlCoreProject.yml for Azure Pipelines

* Update publishSqlCoreProject.yml for Azure Pipelines

* Update publishSqlCoreProject.yml for Azure Pipelines

* Updating json rpc target framework

* Fixing packages to pack

* fixing pattern

* Fixing project pattern

* adding versioning schema

* fixing versioning scheme

* fixing nuget package name

* adding name

* removing var

* Fixing stuff

* Fixing stuff

* Fixing stuff

* Fixing build name

* removing build name

* fixing name

* fixing stuff

* fix pattern

* Fixing stuff

* Fixing feed

* Fix stuff

* Fixing feed

* fixing proj name

* Fixing stuff

* Fixing netframework version

* Fixing target framework

* Adding target framework to dependency

* Fixing frameworks

* adding net7.0

* adding flag

* Fixing target frameworks and making code compatible with lang version

* fixed flag

* Fixing assembly name

* Adding hosting in nuget package

* Fixing tests

* Moving steps to its main pipeline

* only releasing when release is true

* Fixing build scripts

* Adding version to csproj for packaging

* adding version

* Fix dirs

* Adding version number to right prop group

* Adding necessary dis

* Fixing build number

* fixing datatype

* Using different var

* Removing unused yml

* Adding back nullables to hosting

* Adding back more nullables

* adding back more nullables

* moving some props to dir level

* Fixing tests

* Removing dup properties

* Supporting different target frameworks in hosting

* Removing additional setting in csproj

* signing sql core dll in publish

* Fixing version setting

* Adding to build

* Added signing and packaging flag

* Fixing file pattern

test/Microsoft.SqlTools.ServiceLayer.TestDriver/Microsoft.SqlTools.ServiceLayer.TestDriver.csproj

@@ -6,6 +6,7 @@
 	<GenerateAssemblyInfo>false</GenerateAssemblyInfo>
 	<DefineConstants>$(DefineConstants);NETCOREAPP1_0</DefineConstants>
     <IsPackable>false</IsPackable>
+    <TargetFramework>net7.0</TargetFramework>
   </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk"  />