Sidney Parada

[python api] openslide.read_region broke when svs too large

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## Context **Issue type** (bug report or feature request): bug report **Operating system** (e.g. Fedora 24, Mac OS 10.11, Windows 10): Windows 10 **Platform** (e.g. 64-bit x86, 32-bit ARM): 64-bit...

a fast code for get_info and bug solve

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## problems - sometime -rtsp_transport tcp would block the thread because it is not supported  - sometime cost too much time to get info make generate reader block more...

add Provider support

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```golang type OnnxRtProvider func(opts *ort.SessionOptions) (*ort.SessionOptions, error) /* NewCudaProvider - eg conf: { "device_id": 0, "arena_extend_strategy": "kNextPowerOfTwo", "gpu_mem_limit": 2 * 1024 * 1024 * 1024, "cudnn_conv_algo_search": "EXHAUSTIVE", "do_copy_in_default_stream": true, }...