[Feature] Validation errors for multi marked fields like roll number

[Udayraj123]

Is your feature request related to a problem? Please describe. This feature would be useful to separate out a bucket of OMR sheets which contain invalid identifiers like the roll number

Describe the solution you'd like We want to support field-level configuration for validating if the field is allowed to be multi-marked (in the same column/row). The solution should be generic enough for user to configure any field/custom label to be an identifier.

Describe alternatives you've considered We already have a flag by the name filter_out_multimarked_files which is currently False by default. This flag when turned on creates a separate CSV output for the "multimarked" files. But this is not granular to the field level yet. This idea can be extended.

Additional context Additionally we should consider a top level validation schema for all such field level validations.

• Link to the Discord invite
• Link to the Hacktoberfest 2024 channel
• Feature usecase

[Prasadayus]

The solution would involve implementing a field-level configuration that allows users to specify if a particular field (such as roll number) can be multi-marked. This configuration should be flexible enough for users to designate any field or custom label as an identifier.

Additionally, this solution should extend the existing filter_out_multimarked_files flag to be granular at the field level. Users should be able to define which fields are validated for multi-marks, allowing more precise filtering of invalid sheets.

@Udayraj123 Can I work on this?

[Udayraj123]

Interesting, @Prasadayus this is a medium sized issue which can take around a week usually to implement. so I'd prefer if you started with a smaller issue first. I'm still assigning this to you but first raise a PR for an issue that will take shorter time