pkg/bootparam: add bootparam pkg

This adds the bootparam package which can marshal and unmarshal the Linux
kernel command line into boot parameters and a rest section passed to
init.

This is a very quirky format, thus there is a fuzz testing harness
against the reference implementation from the kernel included to verify
correctness.

A set of weird edge cases is rejected by Unmarshal instead of parsing
to nonsensical data as the reference implementation does to save on
complexity in the parser.

Change-Id: I6debfa67e69ae8db4e0356f34ecb127ea27d18de
Reviewed-on: https://review.monogon.dev/c/monogon/+/1125
Tested-by: Jenkins CI
Reviewed-by: Serge Bazanski <serge@monogon.tech>
diff --git a/build/analysis/nogo_config.json b/build/analysis/nogo_config.json
index 885bdef..da28532 100644
--- a/build/analysis/nogo_config.json
+++ b/build/analysis/nogo_config.json
@@ -1,7 +1,8 @@
 {
   "composites": {
     "exclude_files": {
-      "external/": "third_party"
+      "external/": "third_party",
+      "metropolis/pkg/bootparam/": "gofuzz"
     }
   },
   "copylocks": {