TableBlock types: add RawNumberElement and consider typed cell/column_settings models

[zimeg]

Summary

The TableBlock interface in @slack/types is missing the raw_number cell type documented at docs.slack.dev/reference/block-kit/blocks/table-block.

Currently rows is typed as (RichTextBlock | RawTextElement)[][] — but the docs state that table cells can have a type of rich_text, raw_text, or raw_number.

Feature request

1. Add RawNumberElement — a new composition object type alongside RawTextElement:

   export interface RawNumberElement {
     type: 'raw_number';
     text: string;
   }

2. Consider typed models for table cells and column_settings — right now column_settings is TableBlockColumnSettings[] (already typed), but the cell union could be more explicit about what each cell type accepts (e.g. rich_text cells have elements, raw_text/raw_number have text).

Reference

• Table block docs — documents raw_number as a valid cell type
• Current TableBlock definition: packages/types/src/block-kit/blocks.ts

[zimeg]

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https://app.slack.com/block-kit-builder#%7B%22blocks%22:%5B%7B%22type%22:%22table%22,%22rows%22:%5B%5B%7B%22type%22:%22raw_text%22,%22text%22:%22Item%22%7D,%7B%22type%22:%22raw_text%22,%22text%22:%22Count%22%7D%5D,%5B%7B%22type%22:%22raw_text%22,%22text%22:%22Widgets%22%7D,%7B%22type%22:%22raw_number%22,%22value%22:42,%22text%22:%2242%22%7D%5D,%5B%7B%22type%22:%22raw_text%22,%22text%22:%22Gadgets%22%7D,%7B%22type%22:%22raw_number%22,%22value%22:7,%22text%22:%227%22%7D%5D%5D%7D%5D%7D