Arm64 support for dotnet profiler

Hello,

It appears that the .NET profiler does not currently support the arm64 architecture:

`
[2025-01-08 16:05:52.138 | info | PId: 1 | TId: 1] .NET Profiler is explicitly enabled.
[2025-01-08 16:05:52.138 | warning | PId: 1 | TId: 1] Profiler is deactivated because it runs on an unsupported architecture.
`

The relevant code can be found here:
https://github.com/DataDog/dd-trace-dotnet/blob/dc6b7c186cfee88e4c73f530e5e934ceb57d2918/profiler/src/ProfilerEngine/Datadog.Profiler.Native/DllMain.cpp#L142

Additionally, there’s a 2-year-old issue in the Datadog repository tracking this limitation:
https://github.com/DataDog/dd-trace-dotnet/issues/3063

Could we please update the documentation to clearly indicate the current state of support and make it more visible that only the amd64 architecture is supported at this time?

Thank you!

Start with profiler/src/ProfilerEngine/Datadog.Profiler.Native/DllMain.cpp at the referenced architecture check, then review the linked Datadog issue for the current Arm64 limitation. Update the project documentation to make the current amd64-only support and Arm64 status clearly visible.

Written by the indexing model from the issue text.