Drop dependancies

[mstoykov]

fixes #1

[mstoykov]

As expected this means code copied around and unfortunately the one actual configuration that is used by kafka is tagsAsFields and it has the most complex of parsing (of the influxdb options).

The code is mostly just copied and I dropped some abstractions along the way. I have many ... things I don't like about it, but testing this albeit not as hard and slow as I imagined takes a while and I prefer if I do less breaking changes :D

IMO somewhere in the future this extensions (when it is no longer used by k6) should get v2. Where the influxdb configuration is actually prefixed with K6_KAFKA_INFLUXDB instead of K6_INFLUXDB and ... maybe XK6_KAFKA as well ?!?

EIther way I like to point out that this is not meant to be the best of codes I just need this so I don't have to fix it on everytime we do something to those outputs in k6

[na--]

LGTM, though I didn't pay a ton of attention 😅