Integrate LSM tree backend

[marshada]

Business Hypothesis

Using an LSM tree backend to store part of the ledger state will allow us to:

• Achieve better performance wrt the LMDB backend.
• Increase the reliability of the Consensus component through more extensive testing, including fault injection scenarios.

Drivers

• Performance
• Adoption

Functional Requirements

• The backend used to store part of the ledger state is the LSM one.

NFRs

• The performance shall be better than the one achieved by LMDB

External Dependencies

DoD

• QA testing completed.
• Audits completed.
• Benchmarks show no significant regressions.
• Merge to main branch and make a new ouroboros-consensus-cardano release.

[geo2a]

I'm reviving this issue to track my progress on integrating lsm-trees.

[geo2a]

Subsumed by #1526