fix(auth): add scripts to import users to auth0

[adrienjoly]

Follow up of #705. May contribute to #669.

Usage, from project root dir:

$ mongoexport -d ${dbname} -c user --type=json --out ./prod-users.json-lines -u ${dbuser} -p ${dbpassword}
$ node ./scripts/auth0/prepare-import-batches.js # => create files: `prod-users-*.for-auth0.json`
$ ./scripts/auth0/import-prod-users.sh

[codacy-production]

Coverage summary from Codacy

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Coverage variation	Diff coverage
Report missing for e03f12a1	✅ ∅

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (e03f12a)	Report Missing	Report Missing	Report Missing
Head commit (72a5c46)	5385	3137	58.25%

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Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#755)	0	0	∅ (not applicable)

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