New rule: `unnecessary-default-recommendations`

从此 issue 中的两个 #lang resyntax/test 测试用例开始，并查看 issue #587，因为提议的代码块语法是一个依赖项。当移除唯一的 default-recommendations import，同时在还需要另一个 suite 时保留该 import，并与所提供的预期输出一致时，该规则就完成了。

Rule summary

In #lang resyntax/test, the default behavior when no refactoring suite is specified with require: is to use default-recommendations. Therefore, a test file whose only require: statement is require: resyntax/default-recommendations default-recommendations can be omitted.

Test case

#lang resyntax/test

test: "default-recommendations import can be removed"
|--------------------
| #lang resyntax/test
| require: resyntax/default-recommendations default-recommendations
| header: - #lang racket
| test: "some test"
| - (and a (and b c))
| - (and a b c)
|====================
| #lang resyntax/test
| header: - #lang racket
| test: "some test"
| - (and a (and b c))
| - (and a b c)
|--------------------

No-change test case

#lang resyntax/test

no-change-test: "default recommendations import not removed when other imports present"
|--------------------
| #lang resyntax/test
| require: resyntax/default-recommendations default-recommendations
| require: resyntax/default-recommendations boolean-shortcuts
| header: - #lang racket
| test: "some test"
| - (and a (and b c))
| - (and a b c)
|--------------------

Additional context

This relies on #587. The test cases above use the code block syntax proposed in that issue.