fix: consistent break after equals

[jtkiesel]

What changed with this PR:

Long assignment operations are now consistently broken after equals between variable declarations and binary expressions. Assignment operations now avoid breaking after the equals, the way variable declarations do. This also aligns the formatting of these lines more closely to the way Prettier JavaScript does.

Example

Input

class Example {

  void example() {
    foo = new Foo("aaaaaaaaaaaaaaaaaaaa", "bbbbbbbbbbbbbbbbbbbb", "cccccccccccccccccccc", "dddddddddddddddddddd", "eeeeeeeeeeeeeeeeeeee", "ffffffffffffffffffff");

    final Foo bar = new Foo("aaaaaaaaaaaaaaaaaaaa", "bbbbbbbbbbbbbbbbbbbb", "cccccccccccccccccccc", "dddddddddddddddddddd", "eeeeeeeeeeeeeeeeeeee", "ffffffffffffffffffff");
  }
}

Output

class Example {

  void example() {
    foo = new Foo(
      "aaaaaaaaaaaaaaaaaaaa",
      "bbbbbbbbbbbbbbbbbbbb",
      "cccccccccccccccccccc",
      "dddddddddddddddddddd",
      "eeeeeeeeeeeeeeeeeeee",
      "ffffffffffffffffffff"
    );

    final Foo bar = new Foo(
      "aaaaaaaaaaaaaaaaaaaa",
      "bbbbbbbbbbbbbbbbbbbb",
      "cccccccccccccccccccc",
      "dddddddddddddddddddd",
      "eeeeeeeeeeeeeeeeeeee",
      "ffffffffffffffffffff"
    );
  }
}

Relative issues or prs:

Closes #638

[clementdessoude]

Hello @jtkiesel, once again, I took too much time to review, and it caused a small conflict: I can resolve it and push it to main if you want, or I can let you fix it, as you want

[jtkiesel]

@clementdessoude No problem, thank you for reviewing and merging so many of these PRs! I've resolved the conflict here (and in other open PRs).