Support default namespace on RocksDB

[ndr-ds]

Motivation

Other databases support this (including dual store, which uses RocksDB)

Proposal

Add support for namespace not to be provided, and use default in that case, aligning this with other databases implementation

Test Plan

CI

Release Plan

• Nothing to do / These changes follow the usual release cycle.

[ndr-ds]

• Add max blocking threads option to client/server/proxy #3660
• Print total tasks started on benchmark #3659
• More dashboard changes #3658
• [test] Use dual store in deployment #3638
• Test changes #3637
• Fix typo and variable names #3649
• Support default namespace on RocksDB #3648 👈 (View in Graphite)
• docker -> docker-compose #3644 : 1 other dependent PR (#3645 )
• More dashboard changes #3621
• Increase value cache size #3619
• Further tune RocksDB options #3620
• Small changes to benchmark #3617
• Stop printing ChainWorkerRequest #3618
• main

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[ma2bd]

@ndr-ds Can you update test_rocks_db_storage_config_from_str to cover the change?

[ndr-ds]

Ah, right. Will do

[ndr-ds]

Merge activity

• Mar 26, 10:14 AM EDT: A user started a stack merge that includes this pull request via Graphite.
• Mar 26, 10:18 AM EDT: A user merged this pull request with Graphite.