[DOCS] Add Chain Operator Feature: Span Batches

[sbvegan]

Brief Description of the Docs Request

We should have span batches documented and instructions on how to enable it in our docs.

Description of the Documentation You'd Like

Page in Chain Operators > Chain Features > Span Batches

Links to Related Pages

https://specs.optimism.io/protocol/delta/span-batches.html#span-batches
https://op-tip.notion.site/Span-Batch-Design-Docs-b85e599a47774dcdb8171cc84cab2476

Additional Context

• It was added in Delta

[richardgreg]

Hi @cpengilly, what does the tag brand-new-docs indicate?