Add memory allocation and callstack analysis to trace modelsb/tourist

Add AllocationAnalyzer and CallstackAnalyzer in new trace_memory.h/cpp
files that subscribe to Memory.* trace events and build an aggregate
memory model: live allocation tracking, memory-over-time timeline
(sampled at 10ms intervals from Marker events), heap/tag metadata,
per-root-heap statistics, and per-callstack live allocation stats.

Callstack support decodes all four UE callstack formats (raw uint64[],
DeltaVarInt, Delta7bit, XORAndRLE) and resolves frame addresses to
module+offset using ModuleAnalyzer data. Full PDB/DWARF symbolication
is deferred.

Extract TraceTiming and SafeFieldStr to trace_support.h so they can be
shared across trace_support.cpp and trace_memory.cpp without duplication.

Expose the data via seven new JSON API endpoints: alloc-summary, heaps,
alloc-tags, memory-timeline (with range filtering and downsampling),
heap-stats, callstacks (by ID), and callstack-stats (top N by live bytes).
Add has_memory_data flag to the session endpoint.

Also fix non-ASCII characters (em dashes, arrows) throughout trace_support
comments for source file consistency.

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