[TieredStorage] Add TieredStorage::write_accounts_to_hot_storage() API #382
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Problem
The current TieredStorage::write_accounts() API requires a format parameter
to determine which format to use, but this design requires leaking TieredStorage
information to AccountsFile.
Summary of Changes
Instead of requiring AccountsFile to provide a format parameter, this PR adds
TieredStorage::write_accounts_to_hot_storage() API so that AccountsFile
doesn't need to know the detail format information to write accounts to a
hot storage.
Dependency
#72