Release v2.5.8

• Fix getDatabases in transfer (#27)
• Support prometheus remote /api/v1/prom/read and /api/v1/prom/write (#16)
• Support to config write_only for backend
• Fix memory leak in gzip compress in rare cases
• Fix index out of range when query show retention policies in rare cases
• Optimize invalid format log print when writing empty line
• Update github.com/panjf2000/ants/v2 from v2.4.7 to v2.4.8
• Update github.com/spf13/viper from v1.9.0 to v1.10.1
• Update github.com/influxdata/influxdb1-client from v0.0.0-20220302092344 to v0.0.0-20200827194710