enhancement: support for Sway array types

[ra0x3]

Thanks for opening a PR with the Fuel Indexer project. Please review the Checklist below and ensure you've completed all of the necessary steps to make this PR review as painless as possible.

Checklist

• Ensure your top-level commit message is in line with our contributor guidelines.
• 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)
• Please allow Codeowners at least 24 hours to do a first-pass review.
• Please add thoroughly detailed testing steps below.
• Please keep your Changelog message short and sweet.

Description

• PR adds support for indexing array types from Sway contracts
  • Array types are primitives (rust primitives) so no decoding work to be done

Testing steps

• CI should pass (because an existing test was used for this work)

Changelog

• enhancement: support for Sway array types

[deekerno]

LGTM, left one non-blocking (but important) comment.

[deekerno]

Can we switch these unwraps for expects? Seems that the other additions have expects, so we should be consistent.