Convert package to use abstraction

[guyluz11]

The code of this package should be based on the implementations of network_tools and override only the necessary parts that require flutter platform-specific override.

In order to achieve that I have changed the package to use inheritance of services, this will make development and code easier to maintain.

Another benefit is that users call the method exactly the same way as network tools

Old
network_tools: HostScanner.x();
network_tools_flutter HostScannerFlutter.x();

New
network_tools: HostScannerService.instance.x();
network_tools_flutter HostScannerService.instance.x();

To achieve that user needs to initialize the flutter package with this method configureNetworkToolsFlutter at the main function

Change:
configureNetworkTools --> configureNetworkToolsFlutter

This pr is ready but is blocked but based on osociety/network_tools#183 pr to network_tools to work so it is currently blocked.

Fix: #38

This pr does not change the package logic.

[guyluz11]

The test crushed on using git dependency

warning • Publishable packages can't have 'git' dependencies • pubspec.yaml:44:5 • invalid_dependency

Should I wait for network_tools to update and then update this pr?
Or should I advance with it as it is

[codecov]

Codecov Report

Attention: Patch coverage is 48.48485% with 17 lines in your changes are missing coverage. Please review.

Project coverage is 26.74%. Comparing base (df365b1) to head (b9f203e).

Files	Patch %	Lines
...vices_impls/host_scanner_service_flutter_impl.dart	0.00%	12 Missing ⚠️
lib/src/configure_flutter.dart	61.53%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev      #37      +/-   ##
==========================================
+ Coverage   22.38%   26.74%   +4.35%     
==========================================
  Files           3        4       +1     
  Lines          67       86      +19     
==========================================
+ Hits           15       23       +8     
- Misses         52       63      +11     

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