refactor(align-deps): migrate init command

[tido64]

Description

Migrates "init" command to the new config schema.

Test plan

Build align-deps:

cd packages/align-deps
yarn build --dependencies
cd ../test-app

Initialize a new config:

node ../align-deps/lib/cli.js --init

Inspect the generated config and verify that it corresponds to the old config.

Tests were migrated as well.

[tido64]

@afoxman, @kelset: For reference, this is as close to the final state as it currently gets: https://github.com/tido64/rnx-kit/tree/tido/align-deps/better-unresolved-message/packages/align-deps

I realise that some things may look weird and questionable while things are still in a "mixed" state. Even after merging the last changes, I will do another round to make sure everything is throughly cleaned up. Hopefully, everything will make sense by the end of it all.