Retrieving connection parameters (endpoint, bearer token) from a service such as Azure Key Vault

[LKrysik]

Storing the connection data in a file is not the best solution due to security concerns. A better solution is to store the bearer token, endpoint in a more secure location - for example Azure Key Vault.
In this case, in order to establish a connection, the address of the Key Vault and the name of the Secret where the connection parameters will be stored as json as text.
In load_as_pandas in python, there is a simple way to modify the code to support this.
In load_as_spark this requires more changes to the client/src