Http2Client v1.1.4

Optimized Http2Client Library Loading by @Rckov in #2

What's Changed

Optimized Http2Client to avoid loading the native library on every instance creation. Previously each new client would load the same library separately, which was inefficient.
Now the library loads once at startup with Http2Client.Initialize() and all instances share it.

Changes:

• Http2Client.Initialize() - one-time library loading
• Http2Client.IsInitialized - check library status
• Http2Client.Cleanup() - resource cleanup
• Removed per-instance library path configuration

Full Changelog: v1.1.3...v1.1.4