feat: handle properly async mj-include

[codecov[bot]]

Codecov Report

Attention: 195 lines in your changes are missing coverage. Please review.

Comparison is base (7476c14) 92.33% compared to head (a7c1468) 91.47%.

:exclamation: Current head a7c1468 differs from pull request most recent head a57ff4d. Consider uploading reports for the commit a57ff4d to get more accurate results

Files	Patch %	Lines
packages/mrml-wasm/src/lib.rs	0.00%	80 Missing :warning:
packages/mrml-wasm/src/parser/mod.rs	0.00%	19 Missing :warning:
packages/mrml-core/src/mj_head/parse.rs	50.00%	11 Missing :warning:
packages/mrml-core/src/mj_include/head/parse.rs	88.54%	11 Missing :warning:
...ckages/mrml-core/src/prelude/parser/http_loader.rs	82.35%	9 Missing :warning:
packages/mrml-core/src/mj_accordion/parse.rs	79.41%	7 Missing :warning:
...kages/mrml-core/src/prelude/parser/local_loader.rs	0.00%	7 Missing :warning:
packages/mrml-core/src/mj_font/parse.rs	80.64%	6 Missing :warning:
packages/mrml-core/src/mj_style/parse.rs	85.71%	6 Missing :warning:
packages/mrml-core/src/mj_carousel/parse.rs	83.33%	5 Missing :warning:
... and 15 more

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #346 +/- ## ========================================== - Coverage 92.33% 91.47% -0.87% ========================================== Files 232 232 Lines 11721 12479 +758 ========================================== + Hits 10823 11415 +592 - Misses 898 1064 +166 ```

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