reduce the build time

[imotai]

Motivation

• The ut is too easy to fail
• Too much time used to compile db3

The todos

• remove abandoned modules e.g. merkdb
• remove abandoned test cases

PR-Codex overview

This PR focuses on removing unused code and dependencies, as well as making minor changes to improve code organization and readability.

Detailed summary

• Deleted unused code and dependencies
• Removed unused imports and modules
• Refactored code to improve organization and readability

The following files were skipped due to too many changes: src/storage/src/db_store_v2.rs, src/node/src/storage_node_light_impl.rs, src/sdk/src/store_sdk_v2.rs, src/node/src/mutation_utils.rs, src/node/src/command.rs

✨ Ask PR-Codex anything about this PR by commenting with /codex {your question}

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PR-Codex overview

This PR focuses on removing unused code and dependencies.

Detailed summary

• Deleted unused modules and files.
• Removed unused imports and dependencies.
• Removed references to third-party libraries.
• Cleaned up code and organized project structure.

The following files were skipped due to too many changes: src/node/src/storage_node_light_impl.rs, src/storage/src/db_store_v2.rs, src/sdk/src/store_sdk_v2.rs, src/node/src/mutation_utils.rs, src/node/src/command.rs

✨ Ask PR-Codex anything about this PR by commenting with /codex {your question}

---

PR-Codex overview

This PR focuses on removing unused code and dependencies.

Detailed summary:

• Deleted unused files and directories
• Removed unused modules and functions
• Updated dependencies

The following files were skipped due to too many changes: src/node/src/storage_node_light_impl.rs, src/storage/src/db_store_v2.rs, src/sdk/src/store_sdk_v2.rs, src/node/src/mutation_utils.rs, src/node/src/command.rs

✨ Ask PR-Codex anything about this PR by commenting with /codex {your question}