Tag create: respect created_date and created_id params

[colemanw]

Overview

Cleans up the Tag BAO to use more modern patterns and ensures that the created_date and created_id params are respected.

Before

Params ignored. Performs an extra find() lookup even for newly created tags.

After

Params not ignored. Restricted find() to existing tags for efficiency. Removed old pass-by-ref stuff.

[civibot]

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[seamuslee001]

looks like test fails relate @colemanw

[colemanw]

@seamuslee001 fixed