[SecretManagement] Get-secretvault -ListAvailable

[itfranck]

Get-secretvault -ListAvailable - List all secret providers available on the system

It could be nice to get a list of the secret providers available for registration on your system.
I suggest adding a -ListAvailable parameter to the existing Get-SecretVault

Maybe this would tie in well together with

#89
#90

Get-SecretVault could return vault parameters used and / or a list of the available settings (hashtable of settings with empty values) when used in with -ListAvailable

That way, having a Get-SecretVaultRegistrationSettings cmdlet would be rendered redundant.

(Providers, such as Az.keyvault would have to pass their settings list so it can be retrieved when calling the cmdlet with the -ListAvailable switch.