Add experimental HTTP client for ClickHouse

.gitlab/ci/gitlab-gems.gitlab-ci.yml

Gemfile

Gemfile.lock

config/initializers/click_house.rb

gems/click_house-client/.gitlab-ci.yml

gems/click_house-client/.rspec

gems/click_house-client/.rubocop.yml

gems/click_house-client/Gemfile

gems/click_house-client/Gemfile.lock

gems/click_house-client/README.md

gems/click_house-client/click_house-client.gemspec

gems/click_house-client/lib/click_house/client.rb

...lick_house-client/lib/click_house/client/configuration.rb

gems/click_house-client/lib/click_house/client/database.rb

gems/click_house-client/lib/click_house/client/formatter.rb

gems/click_house-client/lib/click_house/client/response.rb

...ouse-client/spec/click_house/client/configuration_spec.rb

...ick_house-client/spec/click_house/client/database_spec.rb

gems/click_house-client/spec/click_house/client_spec.rb

gems/click_house-client/spec/fixtures/query_result.json