refactor(indexer): Derive dynamic field info

[tomxey]

Description of change

Pull from upstream: MystenLabs/sui#19099

Refactors way that dynamic fields are obtained in indexer api, to not use df_object_id, df_name, df_object_type columns in preparation for their removal.

Links to any relevant issues

fixes #5049

Type of change

• Refactoring

How the change has been tested

cargo test --package=iota-indexer --profile=simulator --features=shared_test_runtime

Change checklist

Tick the boxes that are relevant to your changes, and delete any items that are not.

• I have followed the contribution guidelines for this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• I have checked that new and existing unit tests pass locally with my changes

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[kodemartin]

lgtm with minor comments

[sergiupopescu199]

lgtm 🐝