[Add] GOT OCR 2.0 inference pipeline

[MqLeet]

PR types

新增GOT_OCR_2.0的组网代码与推理pipeline

Description

1. 新增GOT_OCR_2.0的组网代码，位于paddlemix/models/GOT
2. 新增GOT_OCR_2.0的推理pipeline，位于paddlemix/examples/GOT_OCR_2_0
3. 新增GOT_OCR_2.0推理pipeline的使用文档，位于paddlemix/examples/GOT_OCR_2_0/README.md

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