Refactor headers

[ospfranco]

• Refactors header file endings to .hpp to reflect proper C++ code
• Hides header from the app to hopefully prevent header clashes
• Set C++ language standard to 23, seems to give a small perf boost

[Copilot]

Pull request overview

This PR refactors the C++/Objective-C++ header layout (renaming internal headers to .hpp and updating includes), and adjusts the CocoaPods spec to change how headers and compilation settings are exported/compiled for iOS consumers.

Changes:

• Renames multiple C++ headers from .h to .hpp and updates include sites accordingly.
• Updates the CocoaPods podspec (notably public header handling and C++ language standard).
• Re-enables a delayed performance test run in the example app.

Reviewed changes

Copilot reviewed 15 out of 18 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
op-sqlite.podspec	Updates pod build configuration, source/exclude lists, and public header exposure.
example/src/App.tsx	Re-enables a delayed performance test execution after app start.
example/ios/Podfile.lock	Updates the example app’s pod lock checksum for op-sqlite.
cpp/utils.hpp	Updates internal includes to .hpp variants.
cpp/utils.cpp	Updates internal includes to .hpp variants (including bridge/threadpool).
cpp/SmartHostObject.hpp	Adds new .hpp header for SmartHostObject.
cpp/SmartHostObject.cpp	Updates include to use SmartHostObject.hpp.
cpp/PreparedStatementHostObject.hpp	Updates threadpool include to .hpp.
cpp/PreparedStatementHostObject.cpp	Updates includes to .hpp variants (host object + bridge).
cpp/OPThreadPool.hpp	Adds new .hpp header for the thread pool interface.
cpp/OPThreadPool.cpp	Updates include to use OPThreadPool.hpp.
cpp/OPSqlite.cpp	Updates internal includes to .hpp variants (host objects, bridge, threadpool).
cpp/DumbHostObject.hpp	Updates SmartHostObject include to .hpp.
cpp/DumbHostObject.cpp	Updates includes to use .hpp variants.
cpp/DBHostObject.hpp	Updates threadpool include to .hpp.
cpp/DBHostObject.cpp	Updates includes to use .hpp variants (DB + prepared statement + bridge).
cpp/bridge.hpp	Updates host object includes to .hpp variants.
cpp/bridge.cpp	Updates includes to use .hpp variants (bridge + host objects).

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