feat: improve performance introduce an object cache

[Manuthor]

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[Copilot]

⚠️ Not ready to approve

It introduces a critical response/serialization correctness issue in KMIP JSON responses and a high-risk cache-staleness/security concern (multi-instance consistency) that should be resolved before approval.

Pull request overview

This PR targets server throughput/latency improvements by reducing hot-path allocations and database round-trips, primarily via a new in-memory retrieve_object cache and several DB/HTTP tuning changes.

Changes:

• Add an in-memory object cache in server_database and integrate it into Database::retrieve_object, with invalidation on mutations.
• Optimize KMIP JSON handling/dispatch (reduced allocations, conditional metrics/policy work) and add an http_workers server setting.
• Improve load-test benchmarking ergonomics (warmup/cooldown) and tune SQLite backend (PRAGMAs, indexes, cached prepared statements).

File summaries

File	Description
documentation/docs/certifications_and_compliance/cryptographic_algorithms/benchmarks/benchmarks_load_tests_5.23.0.md	Reformat benchmark result tables.
documentation/docs/certifications_and_compliance/cryptographic_algorithms/benchmarks/benchmarks_load_tests_5.17.0.md	Reformat benchmark result tables.
crate/server/src/start_kms_server.rs	Apply optional actix-web worker count from config.
crate/server/src/routes/kmip.rs	Reduce JSON allocs/serialization overhead and adjust response construction.
crate/server/src/middlewares/otel_http_middleware.rs	Import ordering tweaks only.
crate/server/src/main.rs	Update test config struct initialization for new server param.
crate/server/src/core/otel_metrics.rs	Import grouping tweaks only.
crate/server/src/core/operations/key_ops/crypto_op.rs	Local-key fast paths + owner authorization fast-path + unwrap guard.
crate/server/src/core/operations/dispatch.rs	Reduce overhead when metrics/policy are disabled.
crate/server/src/core/kms/permissions.rs	Remove debug logging from get_user.
crate/server/src/config/wizard/tests.rs	Update wizard round-trip test struct for new HTTP config field.
crate/server/src/config/wizard/http_wizard.rs	Initialize new HTTP config field in wizard output.
crate/server/src/config/params/server_params.rs	Add http_workers to server params and wire it from config.
crate/server/src/config/command_line/http_config.rs	Add --http-workers / KMS_HTTP_WORKERS config plumbing and display.
crate/server_database/src/stores/sql/sqlite.rs	SQLite PRAGMAs, connection pool sizing, schema bootstrapping indexes, cached prepared statements.
crate/server_database/src/stores/sql/query.sql	Add indexes for owner/state/userid lookups.
crate/server_database/src/lib.rs	Re-export the new cache type.
crate/server_database/src/core/object_cache.rs	New LRU-ish cache with timestamp-based GC for retrieved objects.
crate/server_database/src/core/mod.rs	Add object_cache to Database and move object-count helpers to default-store-only impl.
crate/server_database/src/core/database_objects.rs	Integrate object cache, add invalidation on writes, tweak store routing fast-path.
crate/kmip/src/ttlv/kmip_ttlv_serializer.rs	Pre-allocate serializer stack capacity (constructor no longer const fn).
crate/interfaces/src/stores/objects_store.rs	Whitespace cleanup only.
crate/clients/clap/src/actions/bench.rs	Add warmup/cooldown flags and rework load-test execution model.

Copilot's findings

• Files reviewed: 23/23 changed files
• Comments generated: 13

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