go-mod-discovery: split into more tasks

To make it easier to run individual components of the go module
discovery and generation process, we add invidual tasks as well
as a combined task:

 AVAILABLE TASKS:

   bitbake <recipe> -c discover_modules
       Build project and download modules from proxy.golang.org
       This populates the discovery cache but does NOT extract or generate

   bitbake <recipe> -c extract_modules
       Extract module metadata from discovery cache to modules.json
       Requires: discover_modules to have been run first

   bitbake <recipe> -c generate_modules
       Generate go-mod-git.inc and go-mod-cache.inc from modules.json
       Requires: extract_modules to have been run first

   bitbake <recipe> -c discover_and_generate
       Run all three steps: discover -> extract -> generate
       This is the "do everything" convenience task

   bitbake <recipe> -c show_upgrade_commands
       Show copy-pasteable command lines without running anything

   bitbake <recipe> -c clean_discovery
       Remove the persistent discovery cache

Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>

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