feat: provide support for other package manager like pnpm or yarm

### Prerequisites

- [X] I have read the [Contributing Guidelines](https://github.com/ionic-team/ionic-framework/blob/main/docs/CONTRIBUTING.md#creating-an-issue).
- [X] I agree to follow the [Code of Conduct](https://ionicframework.com/code-of-conduct).
- [X] I have searched for [existing issues](https://github.com/ionic-team/ionic-framework/issues) that already include this feature request, without success.

### Describe the Feature Request

I'm on a Linux system and for me NPM now take forever to install packages and sometimes just halts for minutes.

So I have switched to using 'pnpm' and I would like to be able to create a ionic project where pnpm is used as my package manager.

Ionic CLI is hardcoded to use 'npm' even when I've made an alias for 'npm' as 'pnpm' on my Linux system. As a result npm just hangs creating an ionic project.

### Describe the Use Case

Creating a new project and or general package management.

### Describe Preferred Solution

Just provide a switch to set the package manager, I suggest:

```sh
---pnpm
--yarm
```

Better yet just discover if 'pnpm' or 'yarn' are already install on the system and default to use one of them.

### Describe Alternatives

_No response_

### Related Code

_No response_

### Additional Information

_No response_

Start at the Ionic CLI entry point for creating a new project and trace where npm is selected or invoked. Compare the requested switch with discovering installed pnpm or yarn, then verify the project-creation flow completes with the selected package manager.

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