feat: add attrib and attdef entities

[tarikjabiri]

No description provided.

[codecov]

Codecov Report

Patch coverage is 98.96% of modified lines.

❗ Current head 1fdd8d9 differs from pull request most recent head c8074bf. Consider uploading reports for the commit c8074bf to get more accurate results

Files Changed	Coverage
src/helpers/transform.ts	69.04%
src/tables/table.ts	77.77%
src/tables/layer.ts	84.61%
examples/blocks.ts	100.00%
examples/color.ts	100.00%
examples/dimension.ts	100.00%
examples/hatch.ts	100.00%
examples/index.ts	100.00%
examples/leader.ts	100.00%
examples/lwpolyline.ts	100.00%
... and 92 more

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