Use hash object for passing extra info to deferred function

[sgnn7]

Is your feature request related to a problem? Please describe.

Use of positional arguments in deferred function use seems a bit clunky so we should try to see if we can use a hash of options instead

Describe the solution you would like

• Deferred function with baked-in credentials should be able to support configuration somewhat like this:

$sslcert = @("EOT")
-----BEGIN CERTIFICATE-----
...
-----END CERTIFICATE-----
|-EOT

$dbpass = Sensitive(Deferred(conjur::secret, ['production/postgres/password',
  {
    appliance_url => "https://my.conjur.org",
    account => "myaccount",
    authn_account => "host/myhost",
    authn_api_key => Sensitive("2z9mndg1950gcx1mcrs6w18bwnp028dqkmc34vj8gh2p500ny1qk8n"),
    ssl_certificate => $sslcert
  }))

Describe alternatives you have considered

N/A

Additional context

N/A

[sgnn7]

Released with v3.0.0rc3. Closing.