wgpuAdapterPropertiesFreeMembers is seemingly missing from header

[PJB3005]

• this comment implies it should exist: wgpuAdapterGetProperties is sync but requestAdapterInfo is async #266 (comment)
• Dawn seems to have it? Not familiar with Dawn's codebase though: https://dawn.googlesource.com/dawn/+/bc0f9d611b440eec30fe9c904daefc8dcf5eaa35/src/dawn/native/Adapter.cpp#230
• wgpu-native currently just permanently allocates the adapter info somewhere to avoid memory leak.

[kainino0x]

Oops, the conclusion of that issue was to replate both wgpuAdapterRequestAdapterInfo() and wgpuAdapterGetProperties() with wgpuAdapterGetInfo(). But we forgot to remove wgpuAdapterGetProperties().

Let me reopen that issue so it will have the context and close this one. Thank you for the report!