Add ELF program and section headers to core dump. (dotnet/coreclr#12425)

Add ELF program and section headers to core dump. (dotnet/coreclr#12425)

Add ELF program and section headers to core dump.

Issue dotnet/coreclr#12341

This allows the build id for the modules be extracted properly.

Add .eh_frame, .eh_frame_hdr and some other important sections to core dump.

Add managed module names to core dump so the symbol acquisition
tool can get symbol store keys for them.

Add the non memory/file backed memory regions to core dump so debuggers
like lldb can check if an address is "code" or not. Unwinding doesn't
work when there isn't a module/.so file present.

Commit migrated from https://github.com/dotnet/coreclr/commit/619334db7e5595888e6409570750ccffe4c4c126