Harshavardhana 66fcd02aa2
de-couple walkMu and walkReadMu for some granularity (#13231)
This commit brings two locks instead of single lock for
WalkDir() calls on top of c25816eabc7712893b177b29b4820df0cb81da58.

The main reason is to avoid contention between readMetadata()
and ListDir() calls, ListDir() can take time on prefixes that
are huge for readdir() but this shouldn't end up blocking
all readMetadata() operations, this allows for more room for
I/O while not overly penalizing all listing operations.
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