tooling for generating upstream PRs (including exportify)

[missinglink]

This PR contains a bunch of commands required to author this PR, these make generating patches to WOF 💯 times easier 🎉

Summary:

• new command wof fs import <dir> takes a stream of WOF features and writes them to a filesystem, it creates the nested directory structure if required and optionally runs the WOF 'exportify' tool via docker, this makes them ready to merge upstream 😱
• new command wof feature exportify, same as above except it's streams-in & streams-out (basically just a convenient way of running 'exportify' which supports streams)
• some changes to the wof sqlite fix <db> command:
  • it occurred to me that we may add more fixes in the future and need a way of running them independently, so --hierarchies is now false by default and developers will need to explicitly specify which fixes they would like to apply
  • added --cat flag which prints any documents which were fixed to stdout
  • added --dryrun flag which prevents the DB from being updated, this operation takes time so it's convenient to skip it when using the --cat flag in some workflows

So the cool thing about all this is that it's now possible to write a through2 stream to update WOF records and then write them back to the repo ready for a PR!

It's even possible to import them to a SQLite db and use the rest of the collection to fix integrity issues and again write it back to the filesystem ready for a PR 🧙

Eg:

# clone repo (fa984290faaef47d83c795159558cf7ee5560ca4)
git clone https://github.com/whosonfirst-data/whosonfirst-data-admin-ca.git

# convert to sqlite db
wof git export whosonfirst-data-admin-ca \
  | wof sqlite import ca-fix.db

# fix hierarchies, print updated records to stdout, exportify them and write them back to the filesystem
wof sqlite fix --hierarchies --dryrun --cat ca-fix.db \
  | wof fs import -v --exportify whosonfirst-data-admin-ca/data

[missinglink]

cc/ @Joxit I think you're going to like this 😄

[missinglink]

npm publish
+ @whosonfirst/wof@0.27.0

[Joxit]

Yeah ! That's pretty cool ! In fact I already wrote something for exportify :sweat_smile: I can run the exportify on all files for a specific commit or all stagged files. I'm trying to rewrite the full exportify in rust but it's a pain... :sweat: