Upgrade intl dependency version to `>=0.18.0 <0.20.0`

Fix label `fromJson` parsing issue. (#10)

Support dart 3 (#9)

* Support dart 3.

* Resolve all lint warning and suggestion.

Merge pull request #4 from swaglive/feature/rename-mock

Rename mock database to memory database.

Add globalContext field in log class.

Merge pull request #2 from swaglive/bugs/rename-text-to-message

Resolve all old text field still using in code issue.

Merge pull request #1 from swaglive/features/database-addon

Add tag, context, labels fields in Log class.