Error handling improvements

[yevheniyJ]

Improved error handling to throw Error instances

[codecov]

Codecov Report

Merging #171 (e609105) into master (07a4d31) will decrease coverage by 1.07%.
The diff coverage is 31.43%.

@@            Coverage Diff             @@
##           master     #171      +/-   ##
==========================================
- Coverage   82.46%   81.40%   -1.06%     
==========================================
  Files          29       29              
  Lines        1123     1145      +22     
  Branches       94       97       +3     
==========================================
+ Hits          926      932       +6     
- Misses        136      152      +16     
  Partials       61       61              

Impacted Files	Coverage Δ
src/core/internal/axios/axiosProvider.ts	84.00% <0.00%> (+16.26%)	⬆️
src/core/index.ts	41.61% <32.36%> (-5.18%)	⬇️

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