Provide extended allocators interface (e.g. grow/realloc) like Boost.Container

[Boost.Container allocators support extra interfaces than the standard allocator requirements](https://www.boost.org/doc/libs/1_73_0/doc/html/container/extended_allocators.html).

Some of these functions are useful even to C libraries that used to enjoy `realloc()` like features. So this extra interface is useful even if we're not planning to use it with standard containers.

It'd be nice if Boost.Interprocess could provide a few of these features for its [allocators](https://www.boost.org/doc/libs/1_73_0/doc/html/interprocess/allocators_containers.html) as [`managed_shared_memory`](https://www.boost.org/doc/libs/1_73_0/doc/html/interprocess/managed_memory_segments.html#interprocess.managed_memory_segments.managed_memory_segment_features.allocate_deallocate) has plenty of features not found in Boost.Container allocators and we cannot use Boost.Container extended allocators to manage preallocated memory regions.

首先阅读链接的 Boost.Container 扩展 allocator 文档，然后将其与 Boost.Interprocess 的 allocator 和 managed_shared_memory 文档进行比较。确定哪些 allocator 操作可以支持预分配内存区域，并定义所需的接口和测试。当选定的扩展操作可以通过 Boost.Interprocess allocator 使用，且不依赖标准容器要求时，即视为完成。

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