Add PostgreSQL 18 metrics support

• new collector branch pg_wal_18:
  • remove write, sync, write_time, sync_time metrics
  • move to pg_stat_io
• new collector branch pg_checkpointer_18:
  • new metric num_done
  • new metric slru_written
• new collector branch pg_db_18:
  • new metric parallel_workers_to_launch
  • new metric parallel_workers_launched
• new collector branch pg_table_18:
  • table_parallel_workers_to_launch
  • table_parallel_workers_launched
• new collector branch pg_io_18:
  • new series about WAL statistics
  • new metric read_bytes
  • new metric write_bytes
  • new metric extend_bytes
  • remove op_bytes due to fixed value
• new collector branch pg_vacuuming_18
  • new metric delay_time

https://github.com/pgsty/pg_exporter/releases/tag/v1.0.0

Checksums

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eba8426b2cf50a58db5353562727004a  pg_exporter-1.0.0-1.x86_64.rpm
f691282245f9ef7e712b88985ca0da11  pg_exporter-v1.0.0.darwin-amd64.tar.gz
c133c6077857edd500ab325bad4dc438  pg_exporter-v1.0.0.darwin-arm64.tar.gz
3875487d26bcf9e9ec2e4dcb0c477ee0  pg_exporter-v1.0.0.linux-amd64.tar.gz
395715fbee8894baf0e9c173f8e1babd  pg_exporter-v1.0.0.linux-arm64.tar.gz
f3b23e592f33587d0055984a6d9c2ef3  pg-exporter_1.0.0_amd64.deb
a7305b9c46f8a0d476c9835cc8f01dfe  pg-exporter_1.0.0_arm64.deb