feat(Android): skip sending event when onResults/onPartialResults receive empty array

[aladine]

Context:

• In onResults/onPartialResults sometimes we get empty string and on ReactNative application, we don't need empty string from voice response.
• To save the roundtrip network call via the bridge, I think it is better to filter out empty string from the array sending via event.
• Many dependencies are outdated and worth to upgrade.

Proposed changes:

• Add empty string check before pushing result to array in onResults/onPartialResults
• Update gradle to 8.3 when open the project as a stand alone project in IDE
• Replace jcenter to mavenCentral since jcenter is deprecated
• Update com.android.support:appcompat to androidx equivalent dependency, the default version is 1.2.0