feat: 1) support length_not_equal comparison; 2) All length comparators support numbers; 3) Optimize the is_true and is_not_true comparisons

[wangliang181230]

What this PR does / why we need it?

1. support length_not_equal comparison
2. All length comparators support numbers
3. Optimize the is_true and is_not_true comparisons

Summary of your change

1. 判断器的条件，添加 长度不等于 (len_not_eq) 比较
2. 所有长度比较器都支持数字的长度比较

   封装及复用长度计算方法 compute_length(source_value, target_value)。

3. 优化 is_true 和 is_not_true 判断器

Please indicate you've done the following:

• Made sure tests are passing and test coverage is added if needed.
• Made sure commit message follow the rule of Conventional Commits specification.
• Considered the docs impact and opened a new docs issue or PR with docs changes if needed.

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[wangliang181230]

注：与正则比较器相同的调整。see e86ae7e
但其实最终效果是一样的，因为经过 fnmatch.translate(wildcard) 转换后的正则，会以 \Z 结尾，它的效果和 fullmatch 一样，就是从代码层面明确最终使用的是fullmatch 的效果，更容易让人理解。

[wangliang181230]

is_not_true 和 is_true 没有异常需要捕获，直接去掉。