Configuration array deserializes as dictionary from YAML options

[BernieWhite]

Description of the issue

When configuring configuration options from YAML, array objects are deserialized as a dictionary instead of PSObject[].

To Reproduce

Steps to reproduce the issue:

configuration:
  AZURE_AKS_ADDITIONAL_REGION_AVAILABILITY_ZONE_LIST:
  - location: 'Australia Southeast'
    zones:
      - "1"
      - "2"
      - "3"
  - location: 'Norway East'
    zones:
      - "1"
      - "2"
      - "3"

$o = New-PSRuleOption .\tests\PSRule.Rules.Azure.Tests\ps-rule-options.yaml
$o.Configuration['AZURE_AKS_ADDITIONAL_REGION_AVAILABILITY_ZONE_LIST']

returns:

Key      Value
---      -----
location Australia Southeast
zones    {1, 2, 3}
location Norway East
zones    {1, 2, 3}

Expected behaviour

Object should deserialize as an array of PSObject instead.

Module in use and version:

• Module: PSRule
• Version: 1.6.0

Captured output from $PSVersionTable:

Name                           Value
----                           -----
PSVersion                      7.1.4
PSEdition                      Core
GitCommitId                    7.1.4
OS                             Microsoft Windows 10.0.19043
Platform                       Win32NT
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0…}
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1
WSManStackVersion              3.0

Additional context

See discussion.