refactor(rust): move the notification sender logic to ockam_core #31802

Job	Run time
Rust - build	2m 51s
Rust - build_docs	2m 11s
Rust - build_examples	2m 49s
Rust - build_nightly	3m 24s
Rust - build_release	6m 20s
Rust - check_cargo_update	2m 49s
Rust - check_no_std	1m 34s
Rust - check_nightly	2m 14s
Rust - lint_cargo_readme	55s
Rust - lint_cargo_fmt_check	57s
Rust - lint_cargo_clippy	3m 8s
Rust - lint_cargo_deny	59s
Rust - lint_cargo_toml_files	58s
Rust - ockam_command_cross_build (linux_armv7)	12m 3s
Rust - lint_cargo_machete	52s
Rust - ockam_command_cross_build (macos_silicon)	8m 13s
Rust - test	15m 42s
Rust - test_ockam_command (linux_86)	12m 27s
Rust - test_nightly	15m 27s
Rust - ockam_command_cross_build (linux_aarch64_gnu, ubuntu-22.04, stable, aarch64-unknown-linux-...	12m 39s
Rust - test_postgres	7m 1s
	1h 55m 33s

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