[FEATURE REQ] GraphRbac servicePrincipalsByAppId method was not added to Fluent

**Describe the bug**
"/{tenantID}/servicePrincipalsByAppId/{applicationID}/objectId": {

Swagger PR : https://github.com/Azure/azure-rest-api-specs/pull/5417/files

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Start with the GraphRbac Fluent API and review the linked Azure REST API Swagger PR for the servicePrincipalsByAppId endpoint. Determine where this method belongs and confirm that the Fluent surface exposes the endpoint with its tenant ID, application ID, and object ID parameters.

Scritto dal modello di indicizzazione a partire dal testo della issue.