PSAlignAssignmentStatement: Ignore hashtables with a single key-value pair

[liamjpeters]

PR Summary

Hashtables with a single key-value pair should be ignored by PSAlignAssignmentStatement as there is nothing to align.

There are other rules that handle whitespace around operators etc which can handle formatting according to the users preference.

Currently:

Invoke-Formatter -ScriptDefinition "@{'Key'='Value'}" -Settings @{
    Rules = @{
        PSAlignAssignmentStatement = @{
            Enable = $true
            CheckHashtable = $true
        }
    }
}

Results in:

@{'Key' ='Value'}

Note the space added after the hashtable key

Resolves #1979

PR Checklist

• PR has a meaningful title
  • Use the present tense and imperative mood when describing your changes
• Summarized changes
• Change is not breaking
• Make sure all .cs, .ps1 and .psm1 files have the correct copyright header
• Make sure you've added a new test if existing tests do not effectively test the code changed and/or updated documentation
• This PR is ready to merge and is not Work in Progress.
  • If the PR is work in progress, please add the prefix WIP: to the beginning of the title and remove the prefix when the PR is ready.

[liamjpeters]

My git-foo is not strong so this is a re-raise of #1983 where the full test checks were completed and passed