[component] Add Policy loading and move to new component.py

Adds Policy loading into `SoSComponent()` so that any subcommand can, if
it needs it, have policies loaded consistenly. This is controlled via
the `load_policy` class attr, which defaults to True. Future subcommands
that do not need to have a policy loaded (E.G. the planned `info`
command), can simply set this to False in order to skip this step.

Moves `SoSComponent()` out of sos/__init__.py and into sos/component.py
to ease import conflicts arising from policy loading.

Signed-off-by: Jake Hunsaker <jhunsake@redhat.com>

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