Issue:
feat(user_role): add support to get user role details v2

Add support to return user role details v2
Request will take email and response will return something like
```
[
		{
			role_id: "r1",
			role_name: "name",
			org: {
				name: "Juspay",
				id: "o1"
			},
			merchant: {                       // Optional
				name: "Juspay merchant",
				id: "m1"
			},
			profile: {                        // Optional
				name: "Juspay profile",
				id: "p1"
			},
			status: "status",
			entity_type: "type"
		}
	]
```

Resolution:
<think>
PR Context:
- Title: feat(user_roles): get user role details
- Merged: 2024-09-04T20:38:12Z
- Files changed: 5 files
- Commits: 11 commits

Implementation approach:
## Type of Change
<!-- Put an `x` in the boxes that apply -->

- [ ] Bugfix
- [x] New feature
- [ ] Enhancement
- [ ] Refactoring
- [ ] Dependency updates
- [ ] Documentation
- [ ] CI/CD

## Description
Add support to get user role details

### Additional Changes

- [ ] This PR modifies the API contract
- [ ] This PR modifies the database schema
- [ ] This PR modifies application configuration/environment variables

<!--
Provide links to the files with corresponding changes.
</think>

To implement this, you'll need to modify:


**Detailed Implementation:**


**Commit 1:** feat(user_roles): get user role details (#5777)
Files to modify:


**crates/api_models/src/events/user.rs**
  Modify existing code

**crates/api_models/src/user.rs**
  Add:
    - struct: pub::GetUserRoleDetailsResponseV2
    - struct: pub::NameIdUnit

**crates/router/src/core/user.rs**
  Add:
    - function: pub::list_user_roles_details

**crates/router/src/routes/app.rs**
  Modify existing code

**crates/router/src/routes/user.rs**
  Add:
    - function: pub::list_user_roles_details