Description of change

Create script to autogenerate indexer schema.

Based on upstream patch MystenLabs/sui#19337

Links to any relevant issues

fixes #5008

Type of change

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

How the change has been tested

./scripts/generate_indexer_schema.sh
cargo ci-clippy
cargo +nightly ci-fmt
cargo test --profile simulator --package=iota-indexer --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