[Python] Add metadata index cache for TsFileDataFrame#857
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Persist each shard's MetadataCatalog to a fixed-name index file in the dataset directory so repeated loads skip the expensive native metadata walk. A new use_cache flag (default True) enables it only when a single directory is passed; single-file and list inputs are unchanged. The cache is binary: a pickled sidecar for the small table/device tables plus one numpy int64 structured array per shard for the bulk series stats. Writes are atomic (temp + os.replace); load falls back to a fresh build on a bad magic/version or a changed file set. Source files are not validated, per design.
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Persist each shard's MetadataCatalog to a fixed-name index file in the dataset directory so repeated loads skip the expensive native metadata walk. A new use_cache flag (default True) enables it only when a single directory is passed; single-file and list inputs are unchanged.
The cache is binary: a pickled sidecar for the small table/device tables plus one numpy int64 structured array per shard for the bulk series stats. Writes are atomic (temp + os.replace); load falls back to a fresh build on a bad magic/version or a changed file set. Source files are not validated, per design.