Add support for MariaDB compressed binlog events

[monder]

This would fix #204

Events doc: https://mariadb.com/kb/en/rows_event_v1v2-rows_compressed_event_v1/

Based on this and this

[lance6716]

rest lgtm, did you test these new events?

[lance6716]

we can also support MARIADB_START_ENCRYPTION_EVENT and MARIADB_QUERY_COMPRESSED_EVENT

[monder]

Added MARIADB_QUERY_COMPRESSED_EVENT.
Moved the uncompression functions to mysql package as it is shared.

As for MARIADB_START_ENCRYPTION_EVENT - I added this event only to fill enum values. It is tricky to support it. I added the text description, but since everything (including next event pos) is encrypted this library crashes when it is enabled.

[monder]

rest lgtm, did you test these new events?

Yes.

package main

import (
	"context"
	"os"

	"github.com/go-mysql-org/go-mysql/mysql"
	"github.com/go-mysql-org/go-mysql/replication"
)

func main() {
	cfg := replication.BinlogSyncerConfig{
		ServerID: 100,
		Flavor:   "mariadb",
		Host:     "127.0.0.1",
		Port:     3306,
		User:     "root",
		Password: "teletaips",
	}
	syncer := replication.NewBinlogSyncer(cfg)

	gtidSet, _ := mysql.ParseMariadbGTIDSet("")
	streamer, _ := syncer.StartSyncGTID(gtidSet)

	for {
		ev, _ := streamer.GetEvent(context.Background())
		ev.Dump(os.Stdout)
	}
}

When

log_bin_compress=1
log_bin_compress_min_len=10

With binlog-format = row:

=== MariadbUpdateRowsCompressedEventV1 ===
Date: 2023-05-05 20:59:31
Log position: 596
Event size: 69
TableID: 18
Flags: 1
Column count: 2
Values:
--
0:"kk"
1:"jkhkjhhjkhkh"
--
0:"kk"
1:"jkhkjhhjkhokh"

With binlog-format = statement:

=== MariadbQueryCompressedEvent ===
Date: 2023-05-05 20:55:26
Log position: 2183
Event size: 135
Slave proxy ID: 6
Execution time: 0
Error code: 0
Schema: infogram
Query: update store s set s.value = "jkhkjhhjkhkh" where s.key = "kk"
GTIDSet: 0-1-75

[lance6716]

Thanks!