Add support for GFM Alerts (admonition blocks) via commonmark-ext-gfm-alerts

[omatheusmesmo]

Context

commonmark/commonmark-java#420 has been merged and released as part of commonmark-java 0.28.0, adding a new commonmark-ext-gfm-alerts extension that supports GitHub Flavored Markdown alert blocks (also known as admonition blocks):

Note

This is a note.

Warning

This is a warning.

Supported types out of the box: NOTE, TIP, IMPORTANT, WARNING, CAUTION.

This feature is requested by quarkiverse/quarkus-roq#406 and will be consumed by Roq once available here.

Goal

• Bump commonmark.version from 0.27.0 to 0.28.0 in the root pom.xml
• Add commonmark-ext-gfm-alerts as a dependency in markdown/runtime/pom.xml
• Create an AlertsConfiguration class (following the existing pattern of TablesConfiguration, AutolinkConfiguration, etc.) to register AlertsExtension as a CDI @DefaultBean
• Add integration tests covering the 5 standard alert types

[omatheusmesmo]

I'm working on it!

cc @ia3andy : please let me know if any change is needed on the issue.