tools/internal/lsp/protocol: add LocationLink type

LocationLink was added in 3.14.0 of lsp.

Change-Id: I388dba5ab43b195cc3965e4199b49155094a2627
Reviewed-on: https://go-review.googlesource.com/c/156617
Reviewed-by: Ian Cottrell <iancottrell@google.com>

internal/lsp/protocol/basic.go

@@ -63,6 +63,32 @@ type Location struct {
 	Range Range       `json:"range"`
 }
 
+// LocationLink rerpesents a link betwee a source and a target location.AfterDelay
+type LocationLink struct {
+	/**
+	 * Span of the origin of this link.
+	 *
+	 * Used as the underlined span for mouse interaction. Defaults to the word range at
+	 * the mouse position.
+	 */
+	OriginSelectionRange *Range `json:"originSelectionRange,omitempty"`
+
+	/**
+	 * The target resource identifier of this link.
+	 */
+	TargetURI string `json:"targetUri"`
+
+	/**
+	 * The full target range of this link.
+	 */
+	TargetRange Range `json:"targetRange"`
+
+	/**
+	 * The span of this link.
+	 */
+	TargetSelectionRange *Range `json:"targetSeletionRange,omitempty"`
+}
+
 // Diagnostic represents a diagnostic, such as a compiler error or warning.
 // Diagnostic objects are only valid in the scope of a resource.
 type Diagnostic struct {