Simplify filter type/operator system #40


	name: Go
	on: [push, pull_request]
	env:
	SRC_PATHS: ./api ./collectors/ ./emitters ./operators ./stream ./testutil ./util
	SRC_PATHS_PATTERN: ./api/... ./collectors/... ./emitters/... ./operators/... ./stream/... ./testutil/... ./util/...

	jobs:
	build:
	name: Build
	runs-on: ubuntu-latest
	steps:
	- name: Set up Go 1.16
	uses: actions/setup-go@v2
	with:
	go-version: 1.16.x
	id: go

	- name: Code checkout
	uses: actions/checkout@v2

	- name: golangci-lint
	uses: golangci/golangci-lint-action@v2
	with:
	skip-go-installation: true
	args: ./api ./collectors/ ./emitters ./operators/... ./stream ./testutil ./util

	- name: Code sanity
	run: \|
	go vet $SRC_PATHS_PATTERN
	if [ "$(gofmt -s -l ./api ./collectors ./emitters ./operators ./stream ./testutil ./util \| wc -l)" -gt 0 ]; then exit 1; fi

	- name: Run tests
	run: \|
	go test -v ./api ./collectors/ ./emitters ./operators/... ./stream ./testutil ./util

	- name: Build
	run: \|
	go build ./api ./collectors/ ./emitters ./operators/... ./stream ./testutil ./util

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