fix(android): Handle boolean values in JSON options converter (#6130)

* fix(android): Handle boolean values in JSON options converter

`RNSentryJsonConverter.convertToWritable()` did not handle `Boolean`
values from `sentry.options.json`, silently dropping them. This caused
all boolean options (e.g. `maskAllText`, `debug`, `attachScreenshot`)
to fall back to defaults when using `RNSentrySDK.init()`.

Fixes #6122

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* docs: Add changelog entry for boolean options fix

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

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Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>