[fenix] For https://github.com/mozilla-mobile/fenix/issues/23500: creditcards: focus cardNumberInput in createView

Right now, when the user navigates to the "Add Card" screen, the "Card Number"
title will be focused by default. Instead, let's make it so that the first
field for data entry is focused.

Since we're focusing the first field, let's also make sure that the soft
keyboard opens and that the cursor is placed at the end of whatever text has
already been input.

app/src/main/java/org/mozilla/fenix/settings/creditcards/CreditCardEditorFragment.kt

@@ -16,10 +16,12 @@ import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
 import mozilla.components.support.ktx.android.view.hideKeyboard
+import mozilla.components.support.ktx.android.view.showKeyboard
 import org.mozilla.fenix.R
 import org.mozilla.fenix.SecureFragment
 import org.mozilla.fenix.databinding.FragmentCreditCardEditorBinding
 import org.mozilla.fenix.ext.components
+import org.mozilla.fenix.ext.placeCursorAtEnd
 import org.mozilla.fenix.ext.redirectToReAuth
 import org.mozilla.fenix.ext.showToolbar
 import org.mozilla.fenix.settings.creditcards.controller.DefaultCreditCardEditorController
@@ -70,6 +72,12 @@ class CreditCardEditorFragment : SecureFragment(R.layout.fragment_credit_card_ed
             }
             creditCardEditorView = CreditCardEditorView(binding, interactor)
             creditCardEditorView.bind(creditCardEditorState)
+
+            binding.cardNumberInput.apply {
+                requestFocus()
+                placeCursorAtEnd()
+                showKeyboard()
+            }
         }
     }