Support dmesg filtering options (--facility, --level, --since, and --until options).

[fuad1502]

This PR is a continuation of issue #14

I also implemented RecordIterator in this PR. The reasons are as follows:

• It makes sense to use iterators while implementing filtering options.
• Later, we need to support "online" reads, which is easier to implement with iterators. (see --follow and --follow-new options)
• It "might" improve performance (e.g. eliminate multiple passes through the collection, no need to store intermediary results, potentially better optimized.)

To Do:

• facility
• level
• since
• until

[codecov]

Codecov Report

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[cakebaker]

Good work, thanks :)