tools/kapi: add kernel API specification extraction tool

The kapi tool extracts and renders kernel API specifications from
three input sources and emits them in one of three output formats:

  Input modes:
    --source PATH    parse kerneldoc blocks from a C source file or
                     directory
    --vmlinux PATH   decode the `.kapi_specs` ELF section from a
                     compiled kernel binary
    --debugfs PATH   read the spec dumps exposed under
                     /sys/kernel/debug/kapi/ on a running kernel

  Output formats: plain, json, rst

The tool is written in Rust and builds with cargo from the crates
pinned in Cargo.lock; the resulting binary has no runtime
dependencies. It ships alongside the kernel to give documentation
tools, static analyzers, and IDE integrations a single entry point for
querying the spec data produced by the framework.

Assisted-by: LLM
Signed-off-by: Sasha Levin <sashal@kernel.org>

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