add hook to keep context updated after init Provider creation

[pablito-vt]

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• [ ] I have added test coverage for new or changed functionality
• [ ] I have followed the repository's pull request submission guidelines
• [ ] I have validated my changes against all supported platform versions

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[louis-launchdarkly]

Hello @pablito-vt, thank you for the contribution. We will take a look at the contribution and get back to you later.

[yusinto]

Specific LDontext props and the timing of identifying the LDContext are something we want to defer to the application. As a result we won't be merging this PR, but you can easily include this code in your application. Thank you.