Unable to specify authRole/unauthRole names on amplify init

### Is this feature request related to a new or existing Amplify category?

New category

### Is this related to another service?

IAM

### Describe the feature you'd like to request

My org has restrictions on the roles that can be created with the assumed role I've been granted.

1- The roles created need to have a boundary policy (check... we have amplify init --permissions-boundary)
2- -The role names must start with a speciic prefix.

No way (that I've found) of doing #2 with amplify init.

### Describe the solution you'd like

Have a parameter to amplify init that allows to specify this, e.g.

amplify init --roles-prefix abc-defg

### Describe alternatives you've considered

Haven't found an alternative!

### Additional context

_No response_

### Is this something that you'd be interested in working on?

- [ ] 👋 I may be able to implement this feature request

### Would this feature include a breaking change?

- [ ] ⚠️ This feature might incur a breaking change