feat: Adds an IBAN generator based on patterns functionality

[skwasjer]

See #21

Use case: (integration) testing with generated IBAN's

• Adds a new class IbanGenerator which can be used to generate random IBAN's for testing purposes. Each Generate() invocation returns a new random IBAN.
• Only accepts country codes that are registered in the provided registry (via ctor, default is all 'known' IbanNet countries).
• Generates valid IBAN check digits.
• Generates IBAN's that pass validation (guaranteed, but not considering custom rules).
• Registered in dependency injection containers as interface IIbanGenerator.

Inline example

var generator = new IbanGenerator();
Iban randomIban = generator.Generate("NL");

DI example

IIbanGenerator generator = services.GetRequiredService<IIbanGenerator>();
Iban randomIban = generator.Generate("GB");

Note: does NOT support specifying in specific bank/branch codes. The entire IBAN is completely random (apart from country code/check digits). You can use the generated IBAN icw. the IbanBuilder class to generate a new IBAN with bank/branch codes of choice via some extra custom code.

[codecov-commenter]

Codecov Report

Merging #31 (59f4083) into develop (c632775) will increase coverage by 0.37%.
The diff coverage is 97.67%.

Impacted Files	Coverage Δ
src/IbanNet/Registry/IbanGenerator.cs	96.96% <96.96%> (ø)
...anNet.DependencyInjection.Autofac/IbanNetModule.cs	100.00% <100.00%> (ø)
...ion.ServiceProvider/ServiceCollectionExtensions.cs	100.00% <100.00%> (ø)
src/IbanNet/Builders/BuilderExtensions.cs	100.00% <100.00%> (ø)
src/IbanNet/Registry/IbanCountry.cs	96.15% <0.00%> (+3.84%)	⬆️