feat(constants): Host Types (#5171)

lib/config/env.ts

lib/datasource/cargo/index.ts

lib/datasource/docker/index.ts

lib/datasource/github/index.ts

lib/datasource/go/index.ts

lib/datasource/hex/index.ts

lib/datasource/maven/util.ts

lib/datasource/metadata.ts

lib/datasource/nuget/v2.ts

lib/datasource/nuget/v3.ts

lib/datasource/packagist/index.ts

lib/datasource/pypi/index.ts

lib/datasource/rubygems/get.ts

lib/datasource/terraform-provider/index.ts

lib/datasource/terraform/index.ts

lib/manager/composer/artifacts.ts

lib/manager/gomod/artifacts.ts

lib/platform/azure/azure-got-wrapper.ts

lib/platform/azure/index.ts

lib/platform/bitbucket-server/bb-got-wrapper.ts