Transform hooks into slices of hooks

[samber]

We should be able to add multiple callbacks for each hook:

type InjectorOpts struct {
    HookAfterRegistration []func(scope *Scope, serviceName string)
    HookAfterShutdown     []func(scope *Scope, serviceName string)
        Logf                  []func(format string, args ...any)
}

instead of

type InjectorOpts struct {
    HookAfterRegistration func(scope *Scope, serviceName string)
    HookAfterShutdown     func(scope *Scope, serviceName string)
        Logf                  func(format string, args ...any)
}

Requirement for #70

[samber]

✅