[IDEA] feat: importer to make deserialization easier

[jkowalleck]

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

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