[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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GraphRbac Fluent API から始め、servicePrincipalsByAppId エンドポイントに関するリンク先の Azure REST API Swagger PR を確認します。このメソッドをどこに配置すべきかを判断し、Fluent サーフェスが tenant ID、application ID、object ID の各パラメーターとともにエンドポイントを公開していることを確認します。

索引モデルが issue の本文から書いたものです。