country: introduce a microservice

[php-coder]

Here is the list of CountryService methods that need to be ported/re-implemented:

Method	Used by	Outcome
add	CountryController.processInput	Need an endpoint: yes
findIdsByNames	SeriesInfoExtractorServiceImpl.extractCountry	?
findIdsWhenNameStartsWith	SeriesInfoExtractorServiceImpl.extractCountry	?
findAllAsLinkEntities	CountryController.showCountries, SeriesController.addCountriesToModel and SeriesImportController	?
findOneAsLinkEntity	CountryLinkEntityDtoConverter.convert and @Country (SeriesController, AddSeriesForm, ImportSeriesForm)	?
countAll	SiteController.showIndexPage	php-coder/mystamps-country#1
countCountriesOf	CollectionController.showInfoBySlug	Need an endpoint: yes
countBySlug	UniqueCountrySlugValidator -> UniqueCountrySlug -> AddCountryForm	Need an endpoint: no
countByName	UniqueCountryNameValidator -> UniqueCountryName -> AddCountryForm	Need an endpoint: no
countByNameRu	UniqueCountryNameValidator -> UniqueCountryName -> AddCountryForm	Need an endpoint: no
countAddedSince	CronServiceImpl.getDailyReport -> ReportController.showDailyReport and CronServiceImpl.sendDailyStatistics	?
countUntranslatedNamesSince	CronServiceImpl.getDailyReport -> ReportController.showDailyReport and CronServiceImpl.sendDailyStatistics	?
getStatisticsOf	CollectionController.getCountriesStatistics	?
suggestCountryForUser	SuggestionController.suggestCountryForUser	Need an endpoint: yes

Part of #1162

[php-coder]

The separate repo has been created: https://github.com/php-coder/mystamps-country

[php-coder]

I see there are SQL queries that works with series, collections and collections_series tables. These are the candidates to move to another package (service).