Support custom Firebase storage bucket

[minhdanh]

:sparkles: What kind of change does this PR introduce? (Bug fix, feature, docs update...)

Feature

:arrow_heading_down: What is the current behavior?

Plugin does not support using a custom bucket

:new: What is the new behavior (if this is a feature change)?

This PR adds the ability to use a custom bucket

:boom: Does this PR introduce a breaking change?

No

:bug: Recommendations for testing

:memo: Links to relevant issues/docs

:thinking: Checklist before submitting

• [x] All projects build
• [x] Follows style guide lines (code style guide)
• [x] Relevant documentation was updated
• [x] Rebased onto current develop

[minhdanh]

Hi @hoc081098 can you help to review this?