[1d] Command `mysql:dump`

[balintbrews]

Implement command to export a MySQL dump to a specified destination. Export sanitized data by default and allow a flag to be passed to change that.

mysql:dump --destination=... [--non-sanitized]

• Database credentials should be picked up from .local.spark.yml if it's present. (We're implementing that as part of this issue.)
• To sanitize data use fzaninotto/Faker.

Write a task named taskMySqlDump with the following options (implemented as class methods to set those options):

• host
• port
• dbname
• user
• password
• destination
• sanitize
• fakerLocale
• skip-tables
• structure-only

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