feat(rust): avoiding memory fragmentation by reducing allocations #29952

Job	Run time
Rust - build	2m 37s
Rust - build_docs	1m 50s
Rust - lint_cargo_readme	1m 16s
Rust - check_cargo_update	1m 57s
Rust - build_examples	2m 43s
Rust - check_no_std	2m 20s
Rust - lint_cargo_fmt_check	46s
Rust - build_nightly	3m 58s
Rust - lint_cargo_clippy	2m 53s
Rust - build_release	7m 58s
Rust - check_nightly	2m 46s
Rust - lint_cargo_deny	1m 26s
Rust - lint_cargo_toml_files	1m 20s
Rust - lint_cargo_machete	1m 17s
Rust - test	20m 18s
Rust - test_ockam_command (linux_86)	8m 17s
Rust - test_nightly	21m 28s
Rust - test_postgres	7m 16s
Rust - ockam_command_cross_build (linux_armv7)	13m 2s
Rust - ockam_command_cross_build (macos_silicon)	11m 46s
	1h 57m 14s

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