selftests/ftrace: Add generic boot tracing test framework

Add a generic test framework under tools/testing/selftests/ftrace/boottime/
to verify kernel boot tracing configurations (bootconfig, kernel
command-line tracing options, and persistent ring buffers) during early
boot.

The test runner (run_boottime_test.sh) sources ktap_helpers.sh to generate
output in TAP version 13 format. It builds a minimal initramfs with busybox,
dynamically resolves test specifications (.bconf for bootconfig, .cmdline
for kernel boot parameters, .qemuopts for QEMU options, and # REBOOT: 1
for multi-boot crash/reboot tests with doubled timeout), boots QEMU, and
runs corresponding tracefs checker scripts.

Link: https://lore.kernel.org/all/178649541846.438282.672153252242971310.stgit@devnote2/

Assisted-by: LLM
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>

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