[tcgc] support multiple alias for a parameter via @paramAlias

[chunyu3]

It is common that a property/parameter has more than one alias. But now when we use @paramAlias to define multiple parameter alias, it will only accept one alias (the first line).

// main.tsp
namespace My.Service;

op upload(blobName: string): void;
op download(blobName: string): void;
op theName(bName: string): void;

// client.tsp
import "@azure-tools/typespec-client-generator-core";
using Azure.ClientGenerator.Core;

namespace My.Customizations;

model ClientInitOptions {
  blobClientName: string;
}
@@clientInitialization(MyService, ClientInitOptions)
@@paramAlias(ClientInitOptions.blobClientName, "blobName");
@@paramAlias(ClientInitOptions.blobClientName, "bName")

We need to support a parameter will have multiple alias.
In above scenario, ClientInitOptions.blobClientName has two alias, and both parameter blobName in upload/download operation and bName in theName operation will be bumped to client level.