perf python: Expose addr location, transaction, and context_switch

Expose destination address location components (addr_dso, addr_symbol,
addr_sym_offset), branch/transaction metrics (branch_type, in_tx,
flags, transaction), machine_pid, vcpu, sym_offset, and context_switch
callbacks directly to the Python extension.

Also include supporting fixes and infrastructure updates in
util/python.c and perf.pyi:
- Support fetching sym_offset on resolved sample symbols.
- Populate sample machine_pid and vcpu from evlist__id2sid() when
  perf_guest is enabled, and resolve samples against the matching guest
  or host machine.
- Expose next_prev_pid and next_prev_tid on switch_event only for
  PERF_RECORD_SWITCH_CPU_WIDE records (returning None otherwise).
- Wire up tracing_data in pyrf_session__new() and update perf.pyi type
  stubs (including srccode() and insn() return types).

Assisted-by: Antigravity:gemini-3.1-pro
Signed-off-by: Ian Rogers <irogers@google.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

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