Add missing info to Jackdaw Client API documentation

[LouiseKlodt]

Checklist

• add documentation about subscribed-consumer function and how to use it

• add missing polling interval parameter for consumer log function, and mention optional fuse-fn parameter and its use

• [ ] tests

• [ ] updated CHANGELOG (the "unreleased" section)

[codecov[bot]]

Codecov Report

Merging #285 (91185c4) into master (057ef7c) will increase coverage by 0.36%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #285      +/-   ##
==========================================
+ Coverage   80.05%   80.42%   +0.36%     
==========================================
  Files          42       42              
  Lines        2753     2753              
  Branches      157      157              
==========================================
+ Hits         2204     2214      +10     
+ Misses        392      382      -10     
  Partials      157      157              

Impacted Files	Coverage Δ
src/jackdaw/serdes/edn2.clj	90.90% <0.00%> (+45.45%)	:arrow_up:

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