Improve documentation

[arjun-1]

• Add various JSDocs
• Add partition config to KafkaReader
• Change KafkaGoSaur constructor to take enums

[codecov-commenter]

Codecov Report

Merging #6 (0c42137) into master (6ff4ce4) will decrease coverage by 2.71%.
The diff coverage is 80.00%.

❗ Current head 0c42137 differs from pull request most recent head 6161da8. Consider uploading reports for the commit 6161da8 to get more accurate results

@@            Coverage Diff             @@
##           master       #6      +/-   ##
==========================================
- Coverage   66.36%   63.65%   -2.72%     
==========================================
  Files           9       10       +1     
  Lines         993     1051      +58     
  Branches        9       10       +1     
==========================================
+ Hits          659      669      +10     
- Misses        334      382      +48     

Impacted Files	Coverage Δ
security/sasl.ts	100.00% <ø> (ø)
mod.ts	87.69% <72.72%> (-3.54%)	⬇️
net/connection.ts	100.00% <100.00%> (ø)
net/deno-connection.ts	2.17% <0.00%> (ø)

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