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Utility to dump/restore ledger metadata to/from file

Dumping will dump the serialized metadata to a file. Restoring will
parse the metadata from the file and write it to the metadata store.

Also changes the LedgerIdFormatter to default to long formatter (it
was UUID before, and we don't even currently support UUID ledger ids).

This fixes #1604


Author: Ivan Kelly <ivank@apache.org>
Author: Enrico Olivelli <eolivelli@apache.org>
Author: cguttapalem <cguttapalem@salesforce.com>
Author: Qi Wang <codingwangqi@gmail.com>

Reviewers: Enrico Olivelli <eolivelli@gmail.com>, Sijie Guo <sijie@apache.org>, Jia Zhai <None>

This closes #1667 from ivankelly/dump-metadata-to-from-file

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