[IDEA] feat: importer to make deserialization easier

now taht we have validators, it should be possible to write an importer, like the `outputter`s ...

it should take an arbitrary string,
detect the schema from it, and validate against it
if no schema can be detected, then try trom latest to odest ...

if validaion fails: throw
else: return BOM

tesying: integration test is fine
- load the CDX test data, serialize again, and check for valid data or equalness...

this should imprive the deserialization a lot

先阅读现有的验证器和输出器，了解如何处理模式和序列化。使用 CDX 测试数据进行集成测试，将数据再次序列化并验证输出有效或等效；模式检测和回退行为仍需定义。

由索引模型根据 Issue 内容生成。