Write is_unsigned flag into metadata for an annotation arguments

Instead of adding new kind of types, we'll use flag to disambiguate
 usual types from unsigned ones, this approach has two advantages:
 - less changes in the metadata format
 - it allows naturally extend format for unsigned arrays,
  which will be supported later

 #KT-25310 Fixed
 #KT-25273 Fixed

compiler/testData/loadJava/compiledKotlinWithStdlib/annotations/WithUnsignedTypeParameters.kt

@@ -0,0 +1,16 @@
+// WITH_UNSIGNED
+
+package test
+
+@Target(AnnotationTarget.TYPE, AnnotationTarget.TYPE_PARAMETER)
+annotation class Ann(
+    val ubyte: UByte,
+    val ushort: UShort,
+    val uint: UInt,
+    val ulong: ULong
+)
+
+class A {
+    fun unsigned(s: @Ann(1u, 2u, 3u, 4u) String) {}
+    fun <@Ann(0xFFu, 0xFFFFu, 0xFFFF_FFFFu, 0xFFFF_FFFF_FFFF_FFFFuL) T> typeParam() {}
+}

compiler/testData/loadJava/compiledKotlinWithStdlib/annotations/WithUnsignedTypeParameters.txt

@@ -0,0 +1,19 @@
+package test
+
+public final class A {
+    /*primary*/ public constructor A()
+    public final fun </*0*/ @test.Ann(ubyte = -1.toUByte(), uint = -1.toUInt(), ulong = -1.toULong(), ushort = -1.toUShort()) T> typeParam(): kotlin.Unit
+    public final fun unsigned(/*0*/ s: @test.Ann(ubyte = 1.toUByte(), uint = 3.toUInt(), ulong = 4.toULong(), ushort = 2.toUShort()) kotlin.String): kotlin.Unit
+}
+
+@kotlin.annotation.Target(allowedTargets = {AnnotationTarget.TYPE, AnnotationTarget.TYPE_PARAMETER}) public final annotation class Ann : kotlin.Annotation {
+    /*primary*/ public constructor Ann(/*0*/ ubyte: kotlin.UByte, /*1*/ ushort: kotlin.UShort, /*2*/ uint: kotlin.UInt, /*3*/ ulong: kotlin.ULong)
+    public final val ubyte: kotlin.UByte
+        public final fun <get-ubyte>(): kotlin.UByte
+    public final val uint: kotlin.UInt
+        public final fun <get-uint>(): kotlin.UInt
+    public final val ulong: kotlin.ULong
+        public final fun <get-ulong>(): kotlin.ULong
+    public final val ushort: kotlin.UShort
+        public final fun <get-ushort>(): kotlin.UShort
+}