allow white space for json simple xml element decorator

[shawkiIIalasy]

Add flexibility for allowing white spaces when elements have white space

Current behaviour:

    $xml = `<document><alias> Name</alias></document>`
    
    $arr = LaravelXml::decode('<document><alias> Name</alias></document>', 'SimpleXMLElement', 0, '', false);

    echo $arr['alias']; // `Name`
    so the decoded value of the alias will be `Name` without white space because the package will always trim the subject

Desired behaviour

    $xml = `<document><alias> Name</alias></document>`
    
     // Trim Whitespace (Not allow whitespace)
    $arr = LaravelXml::decode('<document><alias> Name</alias></document>', 'SimpleXMLElement', 0, '', false, false);
    echo $arr['alias']; // ` Name`


    // Allow  Whitespace
    $arr = LaravelXml::decode('<document><alias> Name</alias></document>', 'SimpleXMLElement', 0, '', false, true);
    echo $arr['alias']; // ` Name`


    so the decoded value of the alias will be `Name` without white space by default but if you set allow whitespace true then the alias will be ` Name` with whitespace 

Case

We compare an encrypted XML request from third parties with our request but because the encrypted request was encrypted with whitespace will not match our request, generally, we don't want to edit any value of the XML request

[mtvbrianking]

Hi @shawkiIIalasy,

Thanks for the contribution. It would be nice of you to add a detailed description of what this pull request solves or improves

Code snippet comparisons of the current package behavior vs your desired behavior would make a great illustration.

[mtvbrianking]

@shawkiIIalasy I've added a commit to test allowing significant white space in indented xml

[shawkiIIalasy]

@mtvbrianking

Hi @shawkiIIalasy,

Thanks for the contribution. It would be nice of you to add a detailed description of what this pull request solves or improves

Code snippet comparisons of the current package behavior vs your desired behavior would make a great illustration.

Description Added, Please check

[shawkiIIalasy]

@mtvbrianking please check

[shawkiAlasy]

@mtvbrianking Can you check?

[mtvbrianking]

Hi @shawkiAlasy

The unit tests are still failing

[shawkiIIalasy]

@mtvbrianking Tests: passed