[1d] Command `backup:create files`

[balintbrews]

Implement command to backup a set of files similarly to backup:create db (#32).

backup:create files

• Upload archives to an Amazon S3 bucket.
• Clean up old files in the same Amazon S3 bucket based on the retention policy defined in .spark.yml.

• Use the task taskS3Upload previously implemented in [1d] Command backup:create db #32.
• Use the task taskS3Cleanup previously implemented in [1d] Command backup:create db #32.

Pull the necessary files and exclude options from .spark.yml to define which files the archive needs to include (and exclude).

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

• files
• exclude
• destination

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