Added application callback handler

[gladish]

No description provided.

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[codecov-io]

Codecov Report

Merging #13 into master will decrease coverage by 25.97%.
The diff coverage is 53.33%.

@@             Coverage Diff             @@
##           master      #13       +/-   ##
===========================================
- Coverage   54.54%   28.57%   -25.98%     
===========================================
  Files           1        2        +1     
  Lines          22       35       +13     
  Branches        5        6        +1     
===========================================
- Hits           12       10        -2     
- Misses          7       24       +17     
+ Partials        3        1        -2

Impacted Files	Coverage Δ
src/cimplog-rdk-logger.c	0% <0%> (-54.55%)	⬇️
src/cimplog.c	66.66% <61.53%> (ø)

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