Support more ways of specifying the installation version

Currently, the way script handles versioning is simply by passing the version over to pip as poetry=={version}. This is fine, however it would be nice if we could set the version to something like ^1.3.0, or similar.

This probably shouldn't be too hard to handle, as there's already a regex checking for semver compatibility, and these are just some set of additional characters that could optionally be there. If this specifier isn't there, the script can just use the current approach of ==.

阅读安装程序脚本现有的 semver 验证正则表达式，以及将版本传递给 pip 的代码。检查当前的 poetry=={version} 参数是如何组装的，然后验证支持的限定符（例如 ^1.3.0）是否保留其预期形式，同时普通版本保持当前行为。接受的版本形式均已由测试覆盖时，即视为完成。