add support for multiple property injection

[rfelgent]

Hi @maciejwalkowiak

I would like to suggest one enhancement: introduction of multiple property mapping (instead of a single one):

This leads to a simplified setup, for example:

current, complex approach:

@EnableWireMock({
    @ConfigureWireMock(name = "product-aggregates-service", property = "app.client-apis.product-aggregates.base-path", configurationCustomizers = {WireMockCustomizer.class}),
    @ConfigureWireMock(name = "participations-service", property = "app.client-apis.participations.base-path", configurationCustomizers = {WireMockCustomizer.class}),
    @ConfigureWireMock(name = "businesspartners-service", property = "app.client-apis.businesspartners.base-path", configurationCustomizers = {WireMockCustomizer.class}),
    @ConfigureWireMock(name = "usageinformations-service", property = "app.client-apis.usage-informations.base-path", configurationCustomizers = {WireMockCustomizer.class})
})

new, simplified aproach:

@EnableWireMock({
    @ConfigureWireMock(name = "services",
         property = {
            "app.client-apis.product-aggregates.base-path"
            "app.client-apis.participations.base-path",      
            "app.client-apis.businesspartners.base-path",
            "app.client-apis.usage-informations.base-path"
         },
        configurationCustomizers = {WireMockCustomizer.class})
})

If you are convinced by that feature, I can try to make a PR