internal/stub: move from container

This package solves a very specific stubbing use case, in a less than elegant manner.

Signed-off-by: Ophestra <cat@gensokyo.uk>

container/stub/call.go

@@ -1,37 +0,0 @@
-package stub
-
-import (
-	"slices"
-)
-
-// ExpectArgs is an array primarily for storing expected function arguments.
-// Its actual use is defined by the implementation.
-type ExpectArgs = [5]any
-
-// An Expect stores expected calls of a goroutine.
-type Expect struct {
-	Calls []Call
-
-	// Tracks are handed out to descendant goroutines in order.
-	Tracks []Expect
-}
-
-// A Call holds expected arguments of a function call and its outcome.
-type Call struct {
-	// Name is the function Name of this call. Must be unique.
-	Name string
-	// Args are the expected arguments of this Call.
-	Args ExpectArgs
-	// Ret is the return value of this Call.
-	Ret any
-	// Err is the returned error of this Call.
-	Err error
-}
-
-// Error returns [Call.Err] if all arguments are true, or [ErrCheck] otherwise.
-func (k *Call) Error(ok ...bool) error {
-	if !slices.Contains(ok, false) {
-		return k.Err
-	}
-	return ErrCheck
-}