[TVMScript] Use triple-quoted python strings for metadata #15564
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Prior to this commit, all metadata was output as a single-quoted python string with escaped newlines. This single line could become extremely long, which can cause some text editors to run slowly (e.g. emacs).
This commit updates the TVMScript printer to instead output the metadata using a triple-quoted python string with embedded newlines. Because the metadata is a pretty-printed JSON string, it contains frequent newlines that prevent the line length from causing editor lag.