Add support for -fstack-usage

[ddunl]

This PR adds support for -fstack-usage by adding a generate_stack_usage feature. I roughly tried to follow the generate_linkmap feature as a template.

I left Windows support out because it seems like MSVC doesn't support this and I have no Windows machine to test on, but I can look into this if desired.

If this PR is roughly acceptable I would also like to contribute a similar PR for GCC's -fcallgraph-info. The motivation is for an embedded target I could compute necessary stack usage at build time and give each processor on my target exactly the amount of stack it needs to not waste any IRAM space which I only have tens of kilobytes of.

I'm not sure if this is the correct approach, or if something that solves this problem in a more general way (like a fix for #594) is preferred. Apologies if this is naive in some way, this is at (or past!) the limits of my bazel knowledge 😃

Example usage:

david@Davids-Mac-mini stack_usage_test % cat BUILD *.cc
# BUILD
load("@rules_cc//cc:cc_binary.bzl", "cc_binary")
load("@rules_cc//cc:cc_library.bzl", "cc_library")

cc_library(
    name = "math",
    srcs = ["math.cc"],
    hdrs = ["math.h"],
    features = ["generate_stack_usage"],
)

cc_binary(
    name = "main",
    srcs = ["main.cc"],
    deps = [":math"],
    features = ["generate_stack_usage"],
)
// main.cc
#include <cstdio>
#include "math.h"

int main() {
    int x = add(3, 4);
    int y = multiply(x, 5);
    printf("%d\n", y);
    return 0;
}
// math.cc
#include "math.h"

int add(int a, int b) {
    int result = a + b;
    return result;
}

int multiply(int a, int b) {
    int result = a * b;
    return result;
}
david@Davids-Mac-mini stack_usage_test % bazelisk build //...
Starting local Bazel server (9.0.0) and connecting to it...
INFO: Analyzed 2 targets (86 packages loaded, 475 targets configured).
INFO: Found 2 targets...
INFO: Elapsed time: 3.237s, Critical Path: 0.30s
INFO: 9 processes: 5 action cache hit, 5 internal, 4 darwin-sandbox.
INFO: Build completed successfully, 9 total actions
david@Davids-Mac-mini stack_usage_test % cat bazel-bin/_objs/main/main.su bazel-bin/_objs/math/math.su
main.cc:5:main  48      static
math.cc:4:_Z3addii      16      static
math.cc:9:_Z8multiplyii 16      static