[Formatter] Do not force indentation style unless certain line length were met

Prerequisites

• I have written a descriptive issue title.
• I have searched all issues to ensure it has not already been requested.

Summary

Formatter always format code as the specified indent style no matter how long the statement is:

# before
$foo = if ($true) {1} else {0}

# after 
$foo = if ($true) {
    1
} else {
    0
}

# expected
$foo = if ($true) { 1 } else { 0 }

The code became too sparse by being enforced to the indentation style.

Proposed Design

No response

使用 issue 中的 PowerShell 範例重現 formatter 的行為，然後找出 formatter 的實作及其現有測試。判斷行長條件應如何影響縮排強制；當短述句在不破壞 formatter 既有行為的情況下保留「expected」下所示的精簡形式時，即表示完成。