Add support for schemaless attributes in Database and Structure classes

[ArnabChatterjee20k]

Schema behaviour

Previous

Structure Validations were coming for collection attributes along with the internal attributes resulting to structure exceptions for free form document structure in the mongodb adapter

Current

Structure validations happening for the internal attributes only and not for the free form document in the mongodb

Attributes and query behaviour

Previous

Previously due to attributes metadata storage , validations were able to able run and validations were getting done on the each attribute.
Same for query

Current

For mongodb, the attributes validation are getting skipped -> data directly getting dumped in the underlying db.
For query, we can query on both existing and non existing fields

Index

Same for index

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✨ Finishing touches

🧪 Generate unit tests

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

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