chore: make all types that are used or returned by the public interface also public

[stropitek]

Closes: https://github.com/image-js/image-js-typescript/issues/408

Based on warnings produced by typedoc.

[stropitek]

I will be also adding an option to typedoc-action so that it can treat warnings as errors and that those warnings can be caught early in our PRs.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (58041ea) 98.58% compared to head (26e7836) 98.58%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #411 +/- ## ======================================= Coverage 98.58% 98.58% ======================================= Files 223 223 Lines 5848 5850 +2 Branches 1239 1239 ======================================= + Hits 5765 5767 +2 Misses 80 80 Partials 3 3 ```

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[stropitek]

https://github.com/zakodium/typedoc-action/pull/22

My idea is to do this:

• In PR: treat warnings as errors and skip the step that publishes the documentation
• On the main branch: do not treat warnings as errors and publish the documentation