Prepare v2

[sergeymakinen]

Changes

• Both BSD and ISO timestamps in logs could be parsed now
• Added an optional configuration file to process server replies in NOQUEUE/status/other log records and express them as postfix_smtp_status_replies_total/postfix_smtp_replies_total/postfix_noqueue_reject_replies_total
• Thus postfix_noqueue_rejects_total was removed

[codecov[bot]]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (1ad4689) 80.60% compared to head (8a639f8) 91.15%.

Files	Patch %	Lines
exporter/exporter.go	98.75%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #9 +/- ## =========================================== + Coverage 80.60% 91.15% +10.55% =========================================== Files 4 4 Lines 397 475 +78 =========================================== + Hits 320 433 +113 + Misses 61 36 -25 + Partials 16 6 -10 ```

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