Make RocksDB config dependant of current hardware (#3740)

## Motivation

Previously the RocksDB settings were not dependant on the current hardware

## Proposal

Make them dependent on the current hardware. These settings seem to work well even for the benchmarks, for example.

## Test Plan

Ran benchmarks with these settings

## Release Plan

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

Author: ndr-ds

Cargo.lock

@@ -123,7 +123,6 @@ lru = "0.12.3"
 num-bigint = "0.4.3"
 num-format = "0.4.4"
 num-traits = "0.2.18"
-num_cpus = "1.16.0"
 octocrab = "0.42.1"
 oneshot = "0.1.6"
 pathdiff = "0.2.1"
@@ -172,6 +171,7 @@ similar-asserts = "1.5.0"
 static_assertions = "1.1.0"
 stdext = "0.3.3"
 syn = "2.0.52"
+sysinfo = "0.33.1"
 tempfile = "3.10.1"
 test-case = "3.3.1"
 test-log = { version = "0.2.15", default-features = false, features = [

Cargo.toml

@@ -45,14 +45,14 @@ linera-base.workspace = true
 linera-views-derive.workspace = true
 linera-witty.workspace = true
 linked-hash-map.workspace = true
-num_cpus.workspace = true
 prometheus.workspace = true
 rand = { workspace = true, features = ["small_rng"] }
 rocksdb = { workspace = true, optional = true }
 scylla = { workspace = true, optional = true }
 serde.workspace = true
 sha3.workspace = true
 static_assertions.workspace = true
+sysinfo.workspace = true
 tempfile.workspace = true
 thiserror.workspace = true
 tokio = { workspace = true, features = ["rt", "sync"] }