Revert ios framework

[mugikhan]

Description

The framework bundle for powersync-sqlite-core.framework was causing a "Malformed Framework" error on macOS because it was missing the required symbolic links that are part of the standard framework structure. This was fixed in #41 however this change is not required for the iOS platforms and causes the distribution build (ipa/archive) to fail with an error.

Asset validation failed. Invalid bundle structure. The "Runner.app/Frameworks/powersync-sqlite-core.framework/Versions/A/powersync-sqlite-core" binary file is not permitted. 
Your app cannot contain standalone executables or libraries, other than a valid CFBundleExecutable of supported bundles. 
For details, visit: https://developer.apple.com/documentation/bundleresources/placing_content_in_a_bundle

Changes:

• Revert back to standard structure for iOS frameworks
• Bump versions

Directory Structure: