migrate to react native boot splash

[stelselim]

Description

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• Release Note: I have added a release note in the Mendix Docs repository relevant to the changes introduced in this PR.
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This PR contains

• Bug fix
• Feature
• Refactor
• Documentation
• Dependency Upgrade(s) (add versions)
• Other (describe)

Important Notes

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What should be covered while testing?

...

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[github-actions]

Hi @stelselim, please add a link to the corresponding docs PR in the description. If documentation update is not required for this PR, you can add a comment with 'skip-docs-check' to skip this check.

[vadymv-mendix]

Does it still work correctly with NBUI, i.e. can you upload and use a different splash screen image?