Optional annotations with VEP

[Char-Al]

Currently, SEAL use VEP with a set of mandatory annotations are mandatory. SEAL will rais an error if an annotation is missing. This can be a limitation for instance that do not need all of them.

It would be beneficial to have an option to specify that certain annotations are optional, and if they are missing, the program will continue to run without including those annotations in the output. This would allow users to work with incomplete datasets without encountering errors in the annotation process.