Auth handle multiple user sessions concurrently

### Before opening, please confirm:

- [X] I have [searched for duplicate or closed issues](https://github.com/aws-amplify/amplify-android/issues?q=is%3Aissue+) and [discussions](https://github.com/aws-amplify/amplify-android/discussions).

### Language and Async Model

Kotlin

### Amplify Categories

Authentication

### Gradle script dependencies

```groovy
// Put output below this line

```

### Environment information

```
# Put output below this line

```

### Please include any relevant guides or documentation you're referencing

_No response_

### Describe the feature request

Provides a way to handle multiple user sessions concurrently by manually managing and switching between sessions

### Initialization steps (if applicable)

_No response_

### Code Snippet

```java
// Put your code below this line.

```

### amplifyconfiguration.json

_No response_

### GraphQL Schema

```graphql
// Put your schema below this line

```

### Additional information and screenshots

_No response_

The request concerns Amplify Android Authentication and Kotlin, but it names no files, tests, or entry points. Clarify the session-management API, expected switching behavior, and acceptance criteria before locating the relevant authentication implementation and tests.

Written by the indexing model from the issue text.