update the package markdown table; update the issue templates

[devoncarew]

• update the package markdown table (include the ffigen package)
• update the issue templates

---

• I’ve reviewed the contributor guide and applied the relevant portions to this PR.

Contribution guidelines:

• See our contributor guide for general expectations for PRs.
• Larger or significant changes should be discussed in an issue before creating a PR.
• Contributions to our repos should follow the Dart style guide and use dart format.
• Most changes should add an entry to the changelog and may need to rev the pubspec package version.
• Changes to packages require corresponding tests.

Note that many Dart repos have a weekly cadence for reviewing PRs - please allow for some latency before initial review feedback.

[github-actions]

Package publishing

Package	Version	Status	Publish tag (post-merge)
package:ffigen	10.0.0-dev.0	ready to publish	ffigen-v10.0.0-dev.0
package:native_toolchain_c	0.3.2	already published at pub.dev
package:native_assets_builder	0.3.0	already published at pub.dev
package:native_assets_cli	0.3.2	already published at pub.dev

Documentation at https://github.com/dart-lang/ecosystem/wiki/Publishing-automation.

[dcharkes]

Thanks @devoncarew!