chore: Revert table-role and async-store move into component-toolkit (#242)

[gethinwebster]

Description

Removes the table-role and async-store internal primitives from component-toolkit (src/internal/table-role/, src/internal/async-store/, their package.json subpath exports, and the tsconfig.unit.json lib entry).

These primitives were duplicated here so a separate BasicTable repository could consume them from the toolkit. BasicTable now lives in cloudscape-design/components (src/beta/basic-table-0.1/) and imports these primitives directly from that repo, so the toolkit copies are unused.

Nothing in component-toolkit imports these modules, and the copies in cloudscape-design/components are unaffected.

Verification

• npm run build — passes
• npm run test:unit — 49 suites / 460 tests pass

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.02%. Comparing base (744ad19) to head (3a42296).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #250      +/-   ##
==========================================
+ Coverage   98.09%   99.02%   +0.93%     
==========================================
  Files          56       48       -8     
  Lines        1787     1337     -450     
  Branches      517      369     -148     
==========================================
- Hits         1753     1324     -429     
+ Misses         33       12      -21     
  Partials        1        1              

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