[new rule]: Property names conflict after applying x-ms-client-flatten

### Lint rule description

Property name collisions may occur when applying x-ms-client-flatten. And it's hard to detect when writing swagger. This lint rule can help detect such conflicts.

### Related swagger example

[VirtualNetworkGatewayNatRule](https://github.com/Azure/azure-rest-api-specs/blob/0b1c0be5c97dcd5dadea4e7f975a556a78f58d60/specification/network/resource-manager/Microsoft.Network/stable/2022-01-01/virtualNetworkGateway.json#L2674-L2702) has `type` property name, and `type` is also included in `VirtualNetworkGatewayNatRuleProperties`. And when flatten, they are conflicted.

### Category

SDK

### Severity level

Error

### Applies to

Management plane API spec, Data plane API spec

### How to fix the violation

Change the conflicted name or use `x-ms-client-display-name`

### What't the impact if breaking the rule

Client tools cannot display the correct output.