add: equals method to aggregation and aggregation ops

[therealansh]

Closes #4692 , Sorry for being the impatient one 😬 but would love to contribute.

• [x] Aggregation
• [x] AggregationPipeline
• [ ] AggregationOperations:
  • [x] AddFieldsOperation
  • [x] BasicAggregation
  • [x] BucketAutoOperation

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• [x] You have read the Spring Data contribution guidelines.
• [x] You use the code formatters provided here and have them applied to your changes. Don’t submit any formatting related changes.
• [ ] You submit test cases (unit or integration tests) that back your changes.
• [ ] You added yourself as author in the headers of the classes you touched. Amend the date range in the Apache license header if needed. For new types, add the license header (copy from another file and set the current year only).

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[mp911de]

Sorry for being the impatient one 😬 but would love to contribute.

Thanks a lot for your contribution, we're happy to welcome contributions, also from impatient ones 🤩

While at it, we have a couple more AggregationOperations. Care to extend the pull request by adding equals/hashCode methods to the remaining types as well? That would greatly improve the duration until we can merge your pull request.

[therealansh]

@mp911de was on it already, thats why added a checklist to the PR summary, will extend this PR to cover those as well thanks 🙌🏽