Configuration: Automatically add newlines between sequences of language constructs

[resolritter]

This issue proposes a new configuration which automatically adds newlines between sequences of language constructs

With the following configuration:

"functionExpression.addNewlinesBetween": [
   {
     "match": "AssignmentExpression",
     "followedBy": "ControlFlowExpression"
   }
]

Given the following code

const foo = "bar"
if (foo) {
   baz()
}

With the introduced configuration, a new line would be automatically added between const ... (AssignmentExpression) and if... (ControlFlowExpression).

const foo = "bar"

if (foo) {
   baz()
}

The "AST matching query" syntax is based on this "match"/"followedBy" JSON field member pair, but another idea would be to use tree-sitter's S-expression-based matching. I think this is not needed, though, but I might be oversimplifying the use-case.