feat(types): add data_table Block Kit block

[zimeg]

Summary

Adds the net-new data_table Block Kit block to @slack/types:

• New DataTableBlock interface (type: 'data_table') with rows (required), caption (required), and optional page_size, row_header_column_index, and block_id.
• New DataTableCell helper union (raw_text | raw_number | rich_text) for row cells.
• New RawNumberElement composition object (type: 'raw_number', value, text) for numeric, sortable cells.
• DataTableBlock added to the KnownBlock union.

Follows the conventions of the existing TableBlock / AlertBlock / CardBlock types and their RawTextElement cell object.

Docs

https://docs.slack.dev/reference/block-kit/blocks/data-table-block

Validation

Run against the @slack/types workspace in an isolated worktree off origin/main:

• npm test --workspace=packages/types (runs build via tsc + tsd type tests) — pass. Added happy/sad-path expectAssignable/expectError cases for DataTableBlock in packages/types/test/blocks.test-d.ts.
• npx @biomejs/biome check on the touched files — pass (also enforced by the repo pre-commit hook across all 637 files — pass).

A changeset (.changeset/data-table-block.md, @slack/types minor) is included.

Draft until the broader Block Kit additions land.

Co-Authored-By: Claude svc-devxp-claude@slack-corp.com

[changeset-bot]

🦋 Changeset detected

Latest commit: 8cde938

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@slack/types	Minor

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.90%. Comparing base (a270a6e) to head (8cde938).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2638   +/-   ##
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  Coverage   88.90%   88.90%           
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  Files          63       63           
  Lines       10256    10256           
  Branches      452      452           
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  Hits         9118     9118           
  Misses       1117     1117           
  Partials       21       21           

Flag	Coverage Δ
cli-hooks	88.90% <ø> (ø)
cli-test	88.90% <ø> (ø)
logger	88.90% <ø> (ø)
oauth	88.90% <ø> (ø)
socket-mode	88.90% <ø> (ø)
web-api	88.90% <ø> (ø)
webhook	88.90% <ø> (ø)

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