Implement abstract cache buster: ICacheBuster

[Shazwazza]

The cache buster used should be pluggable - by default it will use the config based cache buster but this could be replaced by a developer with anything. We can specify a default for the debug or production environment options, but also specify a cache buster for an individual bundle.

[Shazwazza]

This is done, the default can be set during startup and also custom ones can be set per bundle. Also a different cache buster can be set for the Debug/Production environments. Example:

Default

services.AddSmidge(_config)
    .Configure<SmidgeOptions>(options =>
    {
        options.DefaultBundleOptions.DebugOptions.SetCacheBusterType<AppDomainLifetimeCacheBuster>();
        options.DefaultBundleOptions.ProductionOptions.SetCacheBusterType<AppDomainLifetimeCacheBuster>();
    });

per bundle

bundles.Create("test-bundle-2", WebFileType.Js, "~/Js/Bundle2")
    .WithEnvironmentOptions(BundleEnvironmentOptions.Create()
            .ForDebug(builder => builder
                .SetCacheBusterType<AppDomainLifetimeCacheBuster>()
            .Build()
    );