chore: move runeutil and memoization into internal

internal/memoization/memoization.go

@@ -1,3 +1,5 @@
+// Package memoization implement a simple memoization cache. It's designed to
+// improve performance in textarea.
 package memoization
 
 import (

internal/runeutil/runeutil.go

@@ -1,5 +1,5 @@
-// Package runeutil provides a utility function for use in Bubbles
+// Package runeutil provides utility functions for tidying up incoming runes
-// that can process Key messages containing runes.
+// from Key messages.
 package runeutil
 
 import (

textarea/textarea.go

@@ -9,9 +9,9 @@ import (
 
 	"github.com/atotto/clipboard"
 	"github.com/charmbracelet/bubbles/v2/cursor"
+	"github.com/charmbracelet/bubbles/v2/internal/memoization"
+	"github.com/charmbracelet/bubbles/v2/internal/runeutil"
 	"github.com/charmbracelet/bubbles/v2/key"
-	"github.com/charmbracelet/bubbles/v2/runeutil"
-	"github.com/charmbracelet/bubbles/v2/textarea/memoization"
 	"github.com/charmbracelet/bubbles/v2/viewport"
 	tea "github.com/charmbracelet/bubbletea/v2"
 	"github.com/charmbracelet/lipgloss"

textinput/textinput.go

@@ -7,8 +7,8 @@ import (
 
 	"github.com/atotto/clipboard"
 	"github.com/charmbracelet/bubbles/v2/cursor"
+	"github.com/charmbracelet/bubbles/v2/internal/runeutil"
 	"github.com/charmbracelet/bubbles/v2/key"
-	"github.com/charmbracelet/bubbles/v2/runeutil"
 	tea "github.com/charmbracelet/bubbletea/v2"
 	"github.com/charmbracelet/lipgloss"
 	rw "github.com/mattn/go-runewidth"