Integrate space after if, with tests to formatter branch

[amrondonp]

• Added 'space after if' rule
• Added unit test for it
• Simple rearrangement of files, created rules folder, separate the formatter implementation from the format file that imports vscode for testing propouses

[ghost]

All CLA requirements met.

[theRoughCode]

Great work! Just a quick feedback regarding the structure. I'm leaning more towards having each file under the rules/ folder each expose an array of rules that are a group of similar rules. For example, rules/operation.ts would expose a set of rules that are related to operations. This imo would make the code within format-document.ts cleaner as the number of rules grow.

[theRoughCode]

LGTM, thanks for the changes!