Add newlines around function bodies

[fyc09]

A BORING problem:

Currently, the generater creates code like following.

  function peg$f21() {    return '';  }

There is no newlines around body, but statements inside are indented. This seems like a mistake. Adding the newlines will make the code looks like:

  function peg$f21() {
    return '';
  }

[hildjj]

This would need several tests, particularly around sourcemaps. It should also not add newlines for blocks that already have them:

foo = "a" {
  return "b";
}

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.48%. Comparing base (2c11061) to head (809ff95).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #649   +/-   ##
=======================================
  Coverage   99.48%   99.48%           
=======================================
  Files          34       34           
  Lines        4313     4313           
=======================================
  Hits         4291     4291           
  Misses         22       22           

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