KDoc link parsing rewrite.

Support qualified names immediately after tag (@see or @param). Detect whether a tag is followed by a reference immediately while lexing, remove TEXT_OR_LINK token type. Remove duplicate nested KDocLink nodes from the PSI structure.

compiler/testData/psi/kdoc/Markdown.txt

@@ -7,12 +7,11 @@ JetFile: Markdown.kt
     KDOC_SECTION
       PsiElement(KDOC_LEADING_ASTERISK)('*')
       PsiElement(KDOC_TEXT)(' ')
-      KDOC_LINK
-        KDOC_MARKDOWN_LINK
-          PsiElement(LBRACKET)('[')
-          KDOC_NAME
-            PsiElement(IDENTIFIER)('WikiLink')
-          PsiElement(RBRACKET)(']')
+      KDOC_MARKDOWN_LINK
+        PsiElement(LBRACKET)('[')
+        KDOC_NAME
+          PsiElement(IDENTIFIER)('WikiLink')
+        PsiElement(RBRACKET)(']')
       PsiWhiteSpace('\n ')
       PsiElement(KDOC_LEADING_ASTERISK)('*')
       PsiElement(KDOC_TEXT)(' ')
@@ -21,12 +20,11 @@ JetFile: Markdown.kt
       PsiWhiteSpace('\n ')
       PsiElement(KDOC_LEADING_ASTERISK)('*')
       PsiElement(KDOC_TEXT)(' [')
-      KDOC_LINK
-        KDOC_MARKDOWN_LINK
-          PsiElement(LBRACKET)('[')
-          KDOC_NAME
-            PsiElement(IDENTIFIER)('DoubleQuotedLink')
-          PsiElement(RBRACKET)(']')
+      KDOC_MARKDOWN_LINK
+        PsiElement(LBRACKET)('[')
+        KDOC_NAME
+          PsiElement(IDENTIFIER)('DoubleQuotedLink')
+        PsiElement(RBRACKET)(']')
       PsiElement(KDOC_TEXT)(']')
       PsiWhiteSpace('\n ')
       PsiElement(KDOC_LEADING_ASTERISK)('*')