enhancement: add support for unindexable types

[ra0x3]

• Please add proper labels
• If there is an issue associated with this PR, please link the issue (right-hand sidebar)
• If there is not an issue associated with this PR, add this PR to the "Fuel Indexer" project (right-hand sidebar)

Description

• PR adds support for a @norelation directive
  • Applying this directive to any field on an object renders the entire object as NoRelation, which means the object is stored as Json
    • I chose Json over Blob because I think it might be easier to extract the item into an object
      • This will definitely require a second pass later
• PR also moves some code around (moves serialize and deserialize from fuel-indexer-schema to fuel-indexer-lib)

Testing steps

• Test was added so CI should pass
• Build assets bash scripts/utils/build_test_wasm_module.bash
• Start a local fuel node cargo run -p fuel-node --bin fuel-node
• Start the web API cargo run -p web-api --bin web-api
• Start the service with the test indexer

cargo run --bin fuel-indexer -- run --manifest packages/fuel-indexer-tests/components/indices/fuel-indexer-test/fuel_indexer_test.yaml --run-migrations

• Trigger some data curl -X POST http://localhost:8000/block
• Open your playground http://localhost:29987/api/playground/fuel_indexer_test/index1
• Make the following query:

query {
  usesnotableentity {
    id
    name
    no_table
  }
}

• Should see your type come back as JSON

{
  "data": [
    {
      "id": 1,
      "name": "hello world",
      "no_table": {
        "name": "norelation",
        "size": 1
      }
    }
  ]
}

• Note that the item NoRelationEntity already comes back as an object straight from the DB, so no further deserialization is needed

Changelog

• enhancement: add support for a @norelation directive that does not create SQL tables for entities

[deekerno]

Functionality looks good; the latest changes from master need to be integrated as the playground shows an error and the docs/schema don't load. But I'm sure they'll work after updating.

Left a couple of comments about readability.