Deprecate request package

[nhatthm]

Description

Deprecate request package to simplify the code base

[codecov]

Codecov Report

Merging #18 (880ecd1) into master (0b88ff0) will decrease coverage by 1.01%.
The diff coverage is 97.32%.

@@             Coverage Diff             @@
##            master      #18      +/-   ##
===========================================
- Coverage   100.00%   98.99%   -1.01%     
===========================================
  Files           21       16       -5     
  Lines          788      793       +5     
===========================================
- Hits           788      785       -3     
- Misses           0        7       +7     
- Partials         0        1       +1     

Flag	Coverage Δ
unittests-Linux	98.99% <97.32%> (-1.01%)	⬇️
unittests-macOS	98.99% <97.32%> (-1.01%)	⬇️

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Impacted Files	Coverage Δ
expectation.go	96.75% <96.75%> (ø)
server.go	99.32% <96.96%> (-0.68%)	⬇️
format/format.go	100.00% <100.00%> (ø)
format/helper.go	100.00% <100.00%> (ø)
helper.go	100.00% <100.00%> (ø)
matcher/body.go	100.00% <100.00%> (ø)
matcher/fn.go	100.00% <100.00%> (ø)
planner/error.go	100.00% <100.00%> (ø)
planner/helper.go	100.00% <100.00%> (ø)
planner/matcher.go	100.00% <100.00%> (ø)
... and 9 more

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