feat(rust): avoiding memory fragmentation by reducing allocations #29949

Job	Run time
Rust - build	2m 45s
Rust - check_cargo_update	1m 54s
Rust - build_docs	1m 31s
Rust - lint_cargo_readme	1m 18s
Rust - build_examples	2m 58s
Rust - ockam_command_cross_build (linux_armv7)	13m 19s
Rust - lint_cargo_fmt_check	43s
Rust - build_nightly	4m 0s
Rust - ockam_command_cross_build (macos_silicon)	11m 9s
Rust - lint_cargo_clippy	2m 52s
Rust - check_no_std	1m 53s
Rust - build_release	8m 8s
Rust - lint_cargo_deny	1m 34s
Rust - check_nightly	2m 52s
Rust - lint_cargo_toml_files	1m 18s
Rust - lint_cargo_machete	1m 26s
Rust - test	20m 7s
Rust - test_ockam_command (linux_86)	7m 43s
Rust - test_nightly	15m 27s
Rust - test_postgres	7m 22s
	1h 50m 19s

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