Update the version format check for canonical swagger

### Lint rule description

For canonical swagger, the version info is "canonical", which violates the existing rule of the formate "Year-Month-Date". Can we make this a special case for canonical swagger?


There are some discussion about it in the channel


### Related swagger example

{
"swagger": "2.0",
"info": {
"title": "Microsoft.Contoso management service",
"version": "canonical",
"description": "Microsoft.Contoso Resource Provider management API.",
"x-canonical-included-versions": [
"v2021_10_01_preview"
],
"x-typespec-generated": [
{
"emitter": "@azure-tools/typespec-autorest-canonical"
}
]
},
"schemes": [
"https"
],
...

### Category

SDK

### Severity level

Error

### Applies to

Management plane API spec, Data plane API spec, RPaaS API spec

### How to fix the violation

For canonical swagger, set the version to "canonical"; for versioned swagger, set the version to the specific version.

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

The information will be misleading.