Add Feature for az create service-connection github for Github Enterprise using token

[vsupreti]

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A clear and concise description of what the problem is. Ex. I cannot create a project..

Describe the solution you'd like
For the command "az devops service-endpoint github create" there is no option to provide GitHub Enterprise Server and authorization using PAT token.
Even by trying to set this up using json code as below, it doesnt configure as GitHub Enterprise
{
"data": {},
"name": "MyGitHubServiceEndpoint",
"type": "GitHub Enterprise Server",
"url": "https://github.orgname.com",
"authorization": {
"parameters": {
"Token": true
},
"scheme": "Token"
},
"isShared": false,
"isReady": true,
"serviceEndpointProjectReferences": [
{
"projectReference": {
"id": "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxx",
"name": "ClientDemoGithubSPN"
},
"name": "MyGitHubServiceEndpoint"
}
]
}

Additional context
Add any other context or screenshots about the feature request here.

[vsupreti]

This is required to create GitHub Enterprise Service connection for the respective DevOps Project. Currently it allows only basic Github service connection to be added.