Add mimalloc support to iggy-server and make it default allocator for… #570

Job	Run time
tag	6s
build release Linux-x86_64-musl	9m 41s
create_github_release	18m 24s
build release Linux-aarch64-musl	7m 20s
merge_docker_manifest	11s
finalize_release	3s
	35m 45s

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