Add intention for converting to block comment and vise versa

So #KT-23137 Fixed

idea/testData/intentions/convertLineCommentToBlockComment/.intention

@@ -0,0 +1 @@
+org.jetbrains.kotlin.idea.intentions.ConvertLineCommentToBlockCommentIntention

idea/testData/intentions/convertLineCommentToBlockComment/afterStatement.kt

@@ -0,0 +1,4 @@
+fun test() {
+    val foo = 1 // comment1<caret>
+    // comment2
+}

idea/testData/intentions/convertLineCommentToBlockComment/afterStatement.kt.after

@@ -0,0 +1,4 @@
+fun test() {
+    val foo = 1 /* comment1 */
+    // comment2
+}

idea/testData/intentions/convertLineCommentToBlockComment/blankLine.kt

@@ -0,0 +1,12 @@
+fun test() {
+    // comment1
+
+    //
+
+    // comment2<caret>
+
+    //
+
+    // comment3
+    val foo = 1
+}

idea/testData/intentions/convertLineCommentToBlockComment/blankLine.kt.after

@@ -0,0 +1,10 @@
+fun test() {
+    /*
+    comment1
+
+    comment2
+
+    comment3
+    */
+    val foo = 1
+}

idea/testData/intentions/convertLineCommentToBlockComment/blockComment.kt

@@ -0,0 +1,7 @@
+// IS_APPLICABLE: false
+fun test() {
+    /*
+    comment
+    */<caret>
+    val foo = 1
+}

idea/testData/intentions/convertLineCommentToBlockComment/includeBlockComment.kt

@@ -0,0 +1,5 @@
+fun test(): Int {
+    // /* comment<caret>
+    val foo = 1
+    return foo
+}

idea/testData/intentions/convertLineCommentToBlockComment/includeBlockComment.kt.after

@@ -0,0 +1,5 @@
+fun test(): Int {
+    /* / * comment */
+    val foo = 1
+    return foo
+}

idea/testData/intentions/convertLineCommentToBlockComment/includeBlockComment2.kt

@@ -0,0 +1,5 @@
+fun test2(): Int {
+    // comment */<caret>
+    val foo = 1
+    return foo
+}

idea/testData/intentions/convertLineCommentToBlockComment/includeBlockComment2.kt.after

@@ -0,0 +1,5 @@
+fun test2(): Int {
+    /* comment * / */
+    val foo = 1
+    return foo
+}

idea/testData/intentions/convertLineCommentToBlockComment/newLinesBetweenCommentAndDeclaration.kt

@@ -0,0 +1,9 @@
+fun foo() {}
+
+
+// comment1
+// comment2
+// comment3<caret>
+
+
+fun bar() {}

idea/testData/intentions/convertLineCommentToBlockComment/newLinesBetweenCommentAndDeclaration.kt.after

@@ -0,0 +1,11 @@
+fun foo() {}
+
+
+/*
+comment1
+comment2
+comment3
+*/
+
+
+fun bar() {}

idea/testData/intentions/convertLineCommentToBlockComment/simple.kt

@@ -0,0 +1,6 @@
+fun test() {
+    val foo = 1
+
+    // comment1<caret>
+    val bar = 1
+}

idea/testData/intentions/convertLineCommentToBlockComment/simple.kt.after

@@ -0,0 +1,6 @@
+fun test() {
+    val foo = 1
+
+    /* comment1 */
+    val bar = 1
+}

idea/testData/intentions/convertLineCommentToBlockComment/simple2.kt

@@ -0,0 +1,8 @@
+fun test() {
+    val foo = 1
+
+    // comment1
+    // comment2<caret>
+    // comment3
+    val bar = 1
+}

idea/testData/intentions/convertLineCommentToBlockComment/simple2.kt.after

@@ -0,0 +1,10 @@
+fun test() {
+    val foo = 1
+
+    /*
+    comment1
+    comment2
+    comment3
+    */
+    val bar = 1
+}