Small fixes to intl4x

[mosuem]

Small bug regarding fraction digits parsing and allow no hook options key in the pubspec.

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[github-actions]

Package publishing

Package	Version	Status	Publish tag (post-merge)
package:intl	0.20.3-wip	WIP (no publish necessary)
package:intl4x	0.11.1	ready to publish	intl4x-v0.11.1
package:intl_translation	0.20.1	already published at pub.dev
package:messages_shrinker	0.2.2-wip	WIP (no publish necessary)

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[github-actions]

PR Health

Breaking changes ✔️

Package	Change	Current Version	New Version	Needed Version	Looking good?
intl4x	None	0.11.0	0.11.1	0.11.0	✔️

Changelog Entry ✔️

Package	Changed Files

Changes to files need to be accounted for in their respective changelogs.

Coverage ⚠️

File	Coverage
pkgs/intl4x/lib/src/hook_helpers/build_options.dart	💔 Not covered
pkgs/intl4x/lib/src/number_format/number_format_options.dart	💚 26 %

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API leaks ✔️

The following packages contain symbols visible in the public API, but not exported by the library. Export these symbols or remove them from your publicly visible API.

Package	Leaked API symbols

License Headers ✔️

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