[Xamarin.Android.Tools.AndroidSdk] Add JdkInfo.GetSupportedJdkInfos() (#142)

Context: https://devdiv.visualstudio.com/DevDiv/_workitems/edit/1415418
Visual Studio needs to know the list of supported JDKs, so that it
can appropriately compare and display them to the user as part of a
"reset to defaults" experience.
The list of "supported" JDKs was formerly provided by the *`internal`*
`JdkInfo.GetPreferredJdkInfos()` method.
Rename `JdkInfo.GetPreferredJdkInfos()` to
`JdkInfo.GetSupportedJdkInfos()`, and make `public`. The rename is
done to reduce ambiguity over what the "preferred" *means*, so that
in public APIs it only means "whatever the user has previously
selected, as per the Windows Registry/`monodroid-config.xml`/etc.

Author: tondat

src/Xamarin.Android.Tools.AndroidSdk/AndroidSdkInfo.cs

@@ -185,7 +185,7 @@ public static void DetectAndSetPreferredJavaSdkPathToLatest (Action<TraceLevel,
 
 logger=logger??DefaultConsoleLogger;
 
-varlatestJdk=JdkInfo.GetPreferredJdkInfos(logger).FirstOrDefault();
+varlatestJdk=JdkInfo.GetSupportedJdkInfos(logger).FirstOrDefault();
 if(latestJdk==null)
 thrownewNotSupportedException("No Microsoft OpenJDK could be found. Please re-run the Visual Studio installer or manually specify the JDK path in settings.");
 

src/Xamarin.Android.Tools.AndroidSdk/JdkInfo.cs

@@ -1,4 +1,4 @@
-usingSystem;
+usingSystem;
 usingSystem.Collections.Generic;
 usingSystem.Collections.ObjectModel;
 usingSystem.Diagnostics;
@@ -280,7 +280,7 @@ static Dictionary<string, List<string>> GetJavaProperties (string java)
 returnprops;
 }
 
-// Keep ordering in sync w/ GetPreferredJdkInfos
+// Keep ordering in sync w/ GetSupportedJdkInfos
 publicstaticIEnumerable<JdkInfo>GetKnownSystemJdkInfos(Action<TraceLevel,string>?logger=null)
 {
 logger=logger??AndroidSdkInfo.DefaultConsoleLogger;
@@ -302,8 +302,10 @@ public static IEnumerable<JdkInfo> GetKnownSystemJdkInfos (Action<TraceLevel, st
 }
 
 // Keep ordering in sync w/ GetKnownSystemJdkInfos
-internalstaticIEnumerable<JdkInfo>GetPreferredJdkInfos(Action<TraceLevel,string>logger)
+publicstaticIEnumerable<JdkInfo>GetSupportedJdkInfos(Action<TraceLevel,string>?logger=null)
 {
+logger=logger??AndroidSdkInfo.DefaultConsoleLogger;
+
 returnMicrosoftOpenJdkLocations.GetMicrosoftOpenJdks(logger)
 .Concat(EclipseAdoptiumJdkLocations.GetEclipseAdoptiumJdks(logger))
 .Concat(MicrosoftDistJdkLocations.GetMicrosoftDistJdks(logger))