Type of change(s)

• Bug fix
• Feature / enhancement
• Infrastructure / tooling (CI, build, deps, tests)
• Documentation

What changed and why

• Refactored build configuration to use newer dependencies and Kotlin DSL.
• Added a isContentBlocked() method for filtering messages by text.

Closes the following issue(s)

• This is for fixing Message with Blocked Keyword Got Through Messages#99

Checklist

• I read the contribution guidelines.
• I manually tested my changes on device/emulator (if applicable).
• I updated the "Unreleased" section in CHANGELOG.md (if applicable).
• I have self-reviewed my pull request (no typos, formatting errors, etc.).
• All checks are passing.