deno.json exports field

[pskfyi]

Adding the exports field causes a new set of lint errors that need to be solved at the same time.

[github-actions]

Release Notes Preview

These notes are auto-generated from the conventional commit messages of this PR, and will be re-generated if the commits are updated.

Chores

• (repo): generate exports field; closes Add exports field #121 (c518a40)

• (repo): add update-exports convenience script; closes Add convenience script for updating deno.json exports field #132 (6044b8f)

• (repo): fix all lint rules for JSR compat; closes Lint fix for JSR compat #123 (c458505)

• (repo): run update-exports script in CI; closes Run update-exports script in CI #150 (f1151ea)

Features

• (deno/exports): init; add determine and updateExports; closes Add deno module with util and script for generating exports field #120 (1c94c18)

Styles

• (repo): apply deno fmt; closes Apply deno fmt #134 (d55878f)