fix: Forward errors to main isolate in renderHtml

[fuzzybinary]

Description

Errors when calling renderHtml were silently failing and resulting in timeouts because the exception wasn't automatically passed to the spawning isolate. Add an separate errorPort to support sending the error to the calling isolate which will properly throw it back the the handler.

This probably also needs to be done for renderData.

Partially fixes #129

Type of Change

🛠️ Bug fix

Ready Checklist

• [x] I've read the Contribution Guide.
• [x] In case this PR changes one of the core packages, I've modified the respective CHANGELOG.md file using the semantic_changelog format.
• [ ] I updated/added relevant documentation (doc comments with ///).
• [ ] I added myself to the AUTHORS file (optional, if you want to).

[github-actions[bot]]

Package Version Report

The following packages have been updated: jaspr : 0.10.0 -> 0.11.0 jaspr_builder : 0.10.0 -> 0.11.0 jaspr_cli : 0.10.0 -> 0.11.0 jaspr_flutter_embed : 0.2.0 -> 0.3.0 jaspr_riverpod : 0.3.9 -> 0.3.10 jaspr_router : 0.3.1 -> 0.3.2 jaspr_test : 0.10.0 -> 0.11.0

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 81.81818% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 59.95%. Comparing base (6ab1cdb) to head (33ba724). Report is 1 commits behind head on main.

Files	Patch %	Lines
...ackages/jaspr/lib/src/server/render_functions.dart	81.81%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #198 +/- ## ======================================= Coverage 59.94% 59.95% ======================================= Files 101 101 Lines 4219 4225 +6 ======================================= + Hits 2529 2533 +4 - Misses 1690 1692 +2 ```

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[schultek]

Thanks for your contribution. I've merged this and will add the same for the renderData method.