schemaless validators , tests fix

[ArnabChatterjee20k]

[x] Index unit tests
[x] Document validator fix
[x] Schemaless tests separation
[x] Fixing breaking test for mongo
[x] Type mismatch error and error processor for mongo
[x] Contains query fix in case of array values for mongo

For references regarding index length(useful links),

• https://stackoverflow.com/questions/19144568/mongo-max-index-size large documents will be skipped from indexing and errors will come
  For example, index is on name and its large but no error

• and for 'key too large' https://stackoverflow.com/questions/6367759/mongodb-key-too-large-to-index it just logs and no error

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch attributes-fix-schemaless

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