Centralize CoreComponent access method

[nlgtuankiet]

:loudspeaker: Type of change

• [ ] Bugfix
• [ ] New feature
• [ ] Enhancement
• [x] Refactoring

:scroll: Description

We have several ways to access the CoreComponent, this PR centralize these methods into one.

:green_heart: How did you test it?

Compile success + run the app where we access the CoreComponent

:pencil: Checklist

• [x] I ran ./gradlew spotlessApply before submitting the PR
• [x] I reviewed submitted code
• [ ] I added tests to verify changes
• [x] All tests passing

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[googlebot]

Thanks for your pull request. It looks like this may be your first contribution to a Google open source project (if not, look below for help). Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

:memo: Please visit https://cla.developers.google.com/ to sign.

Once you've signed (or fixed any issues), please reply here with @googlebot I signed it! and we'll verify it.

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Individual signers

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Corporate signers

• Your company has a Point of Contact who decides which employees are authorized to participate. Ask your POC to be added to the group of authorized contributors. If you don't know who your Point of Contact is, direct the Google project maintainer to go/cla#troubleshoot (Public version).
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[nlgtuankiet]

@googlebot I signed it!

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CLAs look good, thanks!

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CLAs look good, thanks!

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[nlgtuankiet]

is there anything else I can do? @manuelvicnt