Add Samples for getting authentication methods using batch operations

[KenitoInc]

Sample scripts on how to apply batch operations in Graph API calls.
Goal : Performance improvements on operations that involve alot of API calls.

In the sample script, below are the operations

1. Getting all the users in the tenant. We use $users = Get-EntraUser -All
2. Using the users collections, create batch requests, each with a maximum of 20 sub-requests. Each subrequest invokes /users/$($user.id)/authentication/methods endpoint to get authentication methods.
3. We then call Invoke-BatchWithRetry function passing each batch request.

• This function invoke the https://graph.microsoft.com/v1.0/$batch endpoint with the batch payload.
• This function handles 429 errors. This is due to time-out errors

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[givinalis]

@KenitoInc please add a description for this PR to provide sufficient context.

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