Make OrchardCore.Commerce.ContentFields function without OrchardCore.Commerce (OCC-400)

[infofromca]

Is your feature request related to a problem? Please describe

For seperation,
// Currency
services.AddScoped<ICurrencyProvider, CurrencyProvider>();
services.AddScoped<IMoneyService, MoneyService>();

Describe the solution you'd like

to a new layer , or new .proj

Describe alternatives you've considered

A clear and concise description of any alternative solutions or features you've considered.

Jira issue

[sarahelsaig]

Why is this necessary? Those implementations have cross cutting concerns, so they are appropriately placed in OrchardCore.Commerce.

More importantly, the interfaces for both are already in a separate project: OrchardCore.Commerce.MoneyDataType. So you can inject the service or create a custom implementation without making OrchardCore.Commerce.csproj a dependency.

[infofromca]

it make PriceField not independent.

[infofromca]

Related to #678