Follow reader

[zix99]

Replace gotail with internal file following is a significant performance improvement.
Previous benchmark maxed out at 20-30 MB/sec (Likely mostly because of the single-batched channel from gotail)
New benchmarks max out at 500 MB/sec, and seem limited by disk at that point

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[codecov-commenter]

Codecov Report

Merging #66 (4871143) into master (fdbd885) will increase coverage by 0.24%.
The diff coverage is 81.34%.

@@            Coverage Diff             @@
##           master      #66      +/-   ##
==========================================
+ Coverage   82.68%   82.92%   +0.24%     
==========================================
  Files          77       80       +3     
  Lines        2870     2964      +94     
==========================================
+ Hits         2373     2458      +85     
- Misses        360      364       +4     
- Partials      137      142       +5     

Impacted Files	Coverage Δ
pkg/followreader/followreader.go	0.00% <0.00%> (ø)
pkg/followreader/notify.go	83.33% <83.33%> (ø)
pkg/followreader/poller.go	84.00% <84.00%> (ø)
pkg/extractor/batchers/tailBatcher.go	52.38% <100.00%> (-3.56%)	⬇️

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