feat(schema+types): add { errorHandler: true } option to Schema post() for better TypeScript support

[vkarpov15]

Fix #12583

Summary

Requires mongoosejs/kareem#34 . You can now do schema.post('save', { errorHandler: true }, async function(err) { ... }). This means you can use error handling middleware without explicitly listing out arguments, and also makes TypeScript better able to infer the type of params to error handling middleware.

Examples

[hasezoey]

This PR maybe should be changed to a "Draft" (WIP) PR, so that it can not be accidentally merged (even if tests are failing)

[vkarpov15]

@hasezoey good suggestion. But can you please review this PR and mongoosejs/kareem#34 anyway? This PR is ready to go, just hard to test because it requires a PR from a separate repo. Tests pass locally, I just want to make sure the API design makes sense.

[hasezoey]

But can you please review this PR

will try, when the required lower PR is merged and this PR is updated to actually use that package instead of relative path

[hasezoey]

LGTM

and "finally" kareem shipped a new version which cut the size in less than half (thanks to not including useless files like tests anymore)
for reference, 2.4.1 was 109 kB and 2.5.0 is 38.9 kB (bundle size as reported by npm)