[feat][vsc extension] update validators

[techsavvyash]

• Add the validation for ensuring unique combinations of all dimensions in each row for a event data file.
  For example:

state_id,grade_diksha,subject_diksha,avg_play_time_in_mins_on_app_and_portal
12,Class 1,English,1.58
12,Class 1,English,3.77

should throw an error saying that a combination of dimensions is present simultaneously

[techsavvyash]

Linked with other validation related tickets. The plan is to make the validator as a separate service and use it in the VSC extension directly, till the time the package is available the task is to abstract out the validators inside the codebase and use them as a module, that module itself can then be published.