add 13 new dataset converters

[hadipash]

Thank you for your contribution to the MindOCR repo.
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• You have read the Contributing Guidelines on pull requests
• Your code builds clean without any errors or warnings
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Motivation

Add CTW, ICDAR2019-ArT, ReCTS, TextOCR, COCO-Text, LSVT, RCTW-17, MLT-2019, MTWI2018, CASIA-10K, SROIE, CCPD, and BDI dataset converters.

[hadipash]

Rebased onto the main branch to resolve conflicts.