[API Proposal]: Add read/write span methods to UnmanagedMemoryAccessor

[masonwheeler]

Background and motivation

https://github.com/dotnet/runtime/issues/27831 added ReadSpan<T> and WriteSpan<T> methods to SafeBuffer, with the explicit intent of surfacing them in UnmanagedMemoryAccessor in a later PR:

The motivation for this is for a later API proposal to add the same methods to UnmanagedMemoryAccessor which will work for memory mapped views.

This was merged 4 years ago, but the later PR appears to have never happened.

API Proposal

Add the following methods to UnmanagedMemoryAccessor:

+        public void ReadSpan<T>(ulong byteOffset, Span<T> buffer) where T : struct
+        public void WriteSpan<T>(ulong byteOffset, ReadOnlySpan<T> data) where T : struct

Their implementations would be similar to the existing ReadArray<T> and WriteArray<T> methods, doing verification and then calling the corresponding methods on _buffer.

API Usage

string text = "Hello, World!";
myMemoryMappedViewAccessor.WriteSpan(MY_OFFSET, text.AsSpan());

Alternative Designs

No response

Risks

None that I can see; the underlying APIs were developed specifically for this purpose.

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