feat(config): use reference RocksDB defaults

[bladehan1]

What does this PR do?

Remove the unverified storage.dbSettings overrides from the shipped
config.conf, allowing RocksDB defaults to come from reference.conf.

Add a regression test covering the effective block size, L0 compaction
trigger, and target file size.

Why are these changes required?

The shipped configuration overrides the documented RocksDB defaults without
representative production evidence.

In a fixed 500-block Mainnet replay, activating the combined intended options
reduced throughput from 2.421 blocks/s to 1.969 and 1.680 blocks/s. Restoring
the established effective options produced 2.418 blocks/s.

Explicit operator overrides remain supported. This change does not claim or
introduce a new optimized RocksDB profile.

This PR has been tested by:

• ./gradlew :framework:test --tests org.tron.core.config.ConfigurationTest
• ./gradlew :framework:checkstyleMain
• ./gradlew :framework:checkstyleTest

Follow up

Build representative SR block-production benchmarks and observability before
selecting another RocksDB performance profile.

Extra details

No API, protocol, or database-format changes are introduced.

Closes #49

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Summary by cubic

Use RocksDB defaults from reference.conf by removing unverified overrides in the shipped config. This restores documented defaults and avoids the observed throughput regression on Mainnet replay.

• Old behavior: shipped config.conf set custom RocksDB storage.dbSettings (e.g., blocksize=64KB, L0 compaction trigger=4, target file size base=256MB).
• New behavior: config.conf no longer sets storage.dbSettings; effective options come from reference.conf (blocksize=16KB, L0 compaction trigger=2, target file size base=64MB). Explicit operator overrides still work.
• Adds a regression test to pin the effective defaults; no API/protocol/db-format changes.

Rollout

• No action for most deployments. If you require the previous overrides, set storage.dbSettings explicitly in your config (e.g., blocksize=64, level0FileNumCompactionTrigger=4, targetFileSizeBase=256, plus any related keys you relied on).

^{Written for commit bd3ec32. Summary will update on new commits.}

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