Retrieve client secrets for a client

Retrieve the current client secret and the rotated client secrets.

Entitlements required: manageSTSClients (Manage STS clients and token types) or manageAPIClients (Manage API clients) or manageAppAccessAdmin (Manage application lifecycle) or accessDevPortal (Access developer portal) or manageExternalAgents (Manage external agents) or readAppConfigAndClientSecret (Read application configuration with the client secret) or readSTSClientsAndClientSecret (Read STS clients with the client secret and token types) or readAPIClientsAndClientSecret (Read API clients with the client secret) or readExternalAgentsAndClientSecret (Read external agents with the client secret)