InfluxDB out: Add wildcard tags supporting to Tag_Keys

[kirillbdev]

Background

Currently InfluxDB output plugin supports only constant-based tag keys. Example from docs:

[OUTPUT]
    Name          influxdb
    Match         *
    Host          127.0.0.1
    Port          8086
    Database      fluentbit
    Sequence_Tag  _seq
    Tag_Keys      method path # Constant based keys (space separated)

Proposal

Add ability to write more flexible tag keys using wildcard styling. Example config:

[OUTPUT]
    Name          influxdb
    Match         *
    Host          127.0.0.1
    Port          8086
    Database      fluentbit
    Sequence_Tag  _seq
    Tag_Keys      method tag_* # Add as tags all fields which starts with tag_

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