[LLDB][Minidump] Fix ProcessMinidump::GetMemoryRegions to include 64b regions when /proc/pid maps are missing. (#101086)

This PR is in response to a bug my coworker @mbucko discovered where on
MacOS Minidumps were being created where the 64b memory regions were
readable, but were not being listed in
`SBProcess.GetMemoryRegionList()`. This went unnoticed in #95312 due to
all the linux testing including /proc/pid maps. On MacOS generated dumps
(or any dump without access to /proc/pid) we would fail to properly map
Memory Regions due to there being two independent methods for 32b and
64b mapping.

In this PR I addressed this minor bug and merged the methods, but in
order to add test coverage required additions to `obj2yaml` and
`yaml2obj` which make up the bulk of this patch.

Lastly, there are some non-required changes such as the addition of the
`Memory64ListHeader` type, to make writing/reading the header section of
the Memory64List easier.

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