feature/add exact body check option for FullHttpRequestMatcher

[sebastianbuechler]

This PR introduces the ability to require exact body matches in cases of Maps when using the FullHttpRequestMatcher and aims to solve issue #149.

When initiating the DioAdapter it can be specified to use FullHttpRequestMatcher(needsExactBody: true) as matcher parameter. If no value for needsExactyBody is provided then false will be used for default for backwards compatibility.

Additional tests can be found in test/extensions/matches_request_test.dart.

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (a03d15b) 99.28% compared to head (71fdaaa) 99.29%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #158   +/-   ##
=======================================
  Coverage   99.28%   99.29%           
=======================================
  Files          24       24           
  Lines         280      282    +2     
=======================================
+ Hits          278      280    +2     
  Misses          2        2           

Files Changed	Coverage Δ
lib/src/extensions/matches_request.dart	100.00% <100.00%> (ø)
lib/src/matchers/http_matcher.dart	100.00% <100.00%> (ø)

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[LukaGiorgadze]

Thank you @sebastianbuechler , this is awesome!