[indexer]: Use transaction execution endpoint from iota-rest-api in iota-indexer

[tomxey]

Description of change

This is still a draft

Use iota-rest-api in iota-indexer to obtain CheckpointTransaction struct so that we can index the tx effects.

Links to any relevant issues

part of #5870

Type of change

Choose a type of change, and delete any options that are not relevant.

• Enhancement (a non-breaking change which adds functionality)

How the change has been tested

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

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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