swap to tsdown

[jbolda]

Motivation

Handling the tsconfig and project references was painful. Swap to using tsdown for actually bundling.

Approach

Most just setup and shift over.

[github-actions]

Package Changes Through 00443cb

There are 9 changes which include action with minor, @covector/assemble with minor, covector with minor, @covector/apply with minor, @covector/changelog with minor, @covector/files with minor, @covector/command with minor, @covector/toml with minor, @covector/types with minor

Planned Package Versions

The following package releases are the planned based on the context of changes in this pull request.

package	current	next
covector	0.12.5	0.13.0
@covector/apply	0.10.0	0.11.0
@covector/assemble	0.12.0	0.13.0
@covector/changelog	0.12.0	0.13.0
@covector/files	0.8.0	0.9.0
@covector/command	0.8.0	0.9.0
@covector/toml	0.2.0	0.3.0
@covector/types	0.0.0	0.1.0
action	0.12.5	0.13.0

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