Support remaining `$project` use cases

[fcoury]

• Include Exising Fields - https://www.mongodb.com/docs/manual/reference/operator/aggregation/project/#include-existing-fields
• Exclude Fields - https://www.mongodb.com/docs/manual/reference/operator/aggregation/project/#exclude-fields
  • Exclude fields conditionally
• Suppress the _id field - https://www.mongodb.com/docs/manual/reference/operator/aggregation/project/#suppress-the-_id-field
• Add New Fields or Reset Existing Fields - https://www.mongodb.com/docs/manual/reference/operator/aggregation/project/#add-new-fields-or-reset-existing-fields
  • Literal Values
  • Field Rename
  • New Array Fields
• Embedded Document Fields - https://www.mongodb.com/docs/manual/reference/operator/aggregation/project/#embedded-document-fields
  • Path Collision Errors in Embedded Fields - https://www.mongodb.com/docs/manual/reference/operator/aggregation/project/#path-collision-errors-in-embedded-fields
• Restrictions - https://www.mongodb.com/docs/manual/reference/operator/aggregation/project/#restrictions