Upgrade to arrowsquid

[DylanVerstraete]

https://docs.subsquid.io/migrate/migrate-to-arrowsquid/

[sameh-farouk]

Update:
I have been following the process of migrating from version 2 to version 8, but I am finding it to be a bit complex. The migration documentation is not very complete, which has resulted in various errors. While I am working on it alongside other high-priority tasks, progress may be slow.

[sameh-farouk]

Update:
I believe migration would be challenging for several reasons. Thus, I'm considering a rewrite using the latest SDK ArrowSquid as the preferred (or only) option.

The indexer/Archives has been deprecated in favor of using the squid network and their SQD token for indexing and serving the archives/raw data. An alternative would be substrate RPC ingestion, which is expected to be slower when syncing.

So, I'm currently exploring running the ArrowSquid version of the processor with and without the ArrowSquid version of substrate-ingest, which isn't mentioned anywhere in their documentation.

I have started to rewrite the tfchain processor from scratch using the latest Sdk, but I'm still progressing slowly. It's a low-priority task, and I only work on it when I have spare time.