feat: add initial pacman Prometheus exporterv1.0.0

Add the first production-ready release of prometheus-pacman-exporter for
collecting pacman package statistics through the node exporter textfile
collector.

Collect installed, explicit, dependency, unrequired, foreign, native,
orphan, and updateable package metrics. Support checkupdates as an
alternative update source and optional AUR update collection through a
configurable command.

Add the Click-based CLI, Prometheus metric definitions, package
metadata, dependency lockfile, README, licensing metadata, and
development configuration.

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