Decouple `otlp/otlpmetric/otlpmetricgrpc` from `otlp/internal` and `o… #568

	name: Benchmark
	on:
	push:
	branches:
	- main
	env:
	DEFAULT_GO_VERSION: "1.20"
	jobs:
	benchmark:
	name: Benchmarks
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v3
	- uses: actions/setup-go@v4
	with:
	go-version: ${{ env.DEFAULT_GO_VERSION }}
	- name: Run benchmarks
	run: make test-bench \| tee output.txt
	- name: Download previous benchmark data
	uses: actions/cache@v3
	with:
	path: ./benchmarks
	key: ${{ runner.os }}-benchmark
	- name: Store benchmarks result
	uses: benchmark-action/github-action-benchmark@v1.18.0
	with:
	name: Benchmarks
	tool: 'go'
	output-file-path: output.txt
	external-data-json-path: ./benchmarks/data.json
	auto-push: false
	fail-on-alert: false
	alert-threshold: "400%"

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