[FEATURE REQ] Recommend using Boolean return type for API TokenCredentialOptionsProvider.TokenCredentialOptions#isManagedIdentityEnabled

[moarychan]

Is your feature request related to a problem? Please describe.
Recommend using Boolean return type for method TokenCredentialOptionsProvider.TokenCredentialOptions#isManagedIdentityEnabled, the properties bean copying is a bit annoying because the primitive type has a default value, and you can't be sure whether it is false configured by the user or the default value. It will be a break change.

Describe the solution you'd like
Boolean getManagedIdentityEnabled();

Describe alternatives you've considered
N/A

Additional context
N/A

Information Checklist
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