`Get-Node`: Allow `*=<Value>` filter arrays too

[iRon7]

See: Powershell hashmap: nested filtering

Need to further investigate but the assign filter (=) should probably also work on arrays using an asterisk like:

$Test | Get-Node '*.*.group.*=SUBSET'

[iRon7]

See #123:

Wishful thinking:

$Test | Get-Node *.*.group[..]=SUBSET