Build fx subcommands

Command	Description
args	manually edit args.gn for the current build directory
bazel	Run experimental Bazel build for Fuchsia platform tree
build	Run Ninja to build Fuchsia
clean	clean the current Fuchsia build artifacts
clean-build	Clean the build directory and then perform a full build
cleandead	Delete stale generated files in the build output directory.
cleandead-build	Delete stale generated files and then perform a full build.
cmc	Component manifest compiler
fargo	Fargo is a prototype Fuchsia-specific wrapper around Cargo
fetch-build-artifacts	TODO(fxbug.dev/60881): under construction.
gen	run `gn gen` against the Fuchsia build directories.
get-build-dir	print the current fuchsia build directory
get-src-dir	print the Fuchsia source directory (checkout root, aka "//")
get-workspace-dir	print the Bazel workspace directory
gn	meta-build system that generates build files for Ninja
go	Manage Go source code
goma_auth	set up authentication for the Goma distributed compilation client
goma_ctl	control the local Goma distributed compilation client
jq5	Extends the functionality of jq to json5 objects.
list-boards	list boards available for building
list-packages	list packages are built
list-products	list products available for building
ninja	directly run the build system. Don't use for regular workflows.
ninjatrace2json	Collect Ninja trace information for analysis in chrome://tracing
repro	Locally replicate the result of infra builds and tests
run-in-build-dir	Run the given command at the root of the current build directory
self-build	build the minimal host dependencies to run fx main workflows
set	set up a build directory
set-build-dir	set the default build directory used by other fx commands
use	re-use a previous build directory set up by `fx set`
check-deps	checks dependency graph in areas
compdb	DEPRECATED
goma	manage Goma distributed compilation client
ls-buildid	Find binaries among build directories, the checkout, and cloud storage
symbol-index	(deprecated) manipulate the symbol-index file
validate-sdk	Attempt to build a few known SDK-based OOT repos based on a core SDK