chore: Split google-apis-core into a separate gem (#2134)

google-api-client/google-api-client.gemspec

@@ -13,24 +13,19 @@ Gem::Specification.new do |gem|
   gem.metadata      = {
     "documentation_uri" => "https://googleapis.dev/ruby/google-api-client/v#{Google::Apis::VERSION}"
   }
-
-  gem.files         = `git ls-files -z`
-                      .split("\x0")
-                      .reject { |f| f.match(%r{^(spec|script)/|^api_names_out|synth\.metadata}) }
+  gem.files         = Dir.glob("lib/**/*") +
+                      Dir.glob("generated/**/*.rb") +
+                      Dir.glob("docs/**/*") +
+                      Dir.glob("bin/**/*") +
+                      Dir.glob("*.md") +
+                      [".yardopts", "LICENSE"]
 
   gem.executables   = gem.files.grep(%r{^bin/}) { |f| File.basename(f) }
   gem.require_paths = %w[lib generated]
 
   gem.required_ruby_version = '>= 2.4'
 
-  gem.add_runtime_dependency 'representable', '~> 3.0'
-  gem.add_runtime_dependency 'retriable', '>= 2.0', '< 4.0'
-  gem.add_runtime_dependency 'addressable', '~> 2.5', '>= 2.5.1'
-  gem.add_runtime_dependency 'mini_mime', '~> 1.0'
-  gem.add_runtime_dependency 'signet', '~> 0.12'
-  gem.add_runtime_dependency 'googleauth', '~> 0.9'
-  gem.add_runtime_dependency 'httpclient', '>= 2.8.1', '< 3.0'
-  gem.add_runtime_dependency 'rexml'
+  gem.add_runtime_dependency 'google-apis-core', '~> 0.0'
   gem.add_development_dependency 'thor', '~> 0.19'
   gem.add_development_dependency 'activesupport', '>= 4.2', '< 5.1'
 end