perf python: Port arm-cs-trace-disasm to perf module

Port arm-cs-trace-disasm.py to a standalone script in tools/perf/python/
using the perf module directly.

Improvements compared to the legacy script:
- Encapsulate trace disassembly state in a TraceDisasm class.
- Default to itrace="b" when creating perf.session() (overridable via
  --itrace or PERF_ITRACE) so all CoreSight branch samples are
  synthesized without requiring --itrace=b on the command line.
- Automatically search standard kernel debug paths (find_vmlinux())
  when -k/--vmlinux is not specified, and query
  perf.config_get("annotate.objdump") for the default objdump binary.
- Bound DISASM_CACHE memory consumption by evicting the cache at 1024
  entries and skipping caching of oversized (> 512 lines) objdump
  outputs.
- Use sample.srccode() from the perf extension module to annotate
  disassembly output with source filenames, line numbers, and source
  lines.

Update the ARM CoreSight disassembly shell test
(test_arm_coresight_disasm.sh) to invoke the standalone script.

Assisted-by: Antigravity:gemini-3.1-pro
Reviewed-by: James Clark <james.clark@linaro.org>
Signed-off-by: Ian Rogers <irogers@google.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

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