feat: add grpc instrumentation

See <https://github.com/hibachrach/opentelemetry-instrumentation-grpc/>
for previous git history

instrumentation/grpc/.rspec

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+--format documentation
+--color
+--require spec_helper

instrumentation/grpc/.standard.yml

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+# For available configuration options, see:
+#   https://github.com/standardrb/standard
+ruby_version: 3.0

instrumentation/grpc/CHANGELOG.md

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+## [Unreleased]
+
+## [0.1.3] - 2024-09-11
+
+- Fix error in handling of non-gRPC errors
+- Fix error in method signature for OpenTelemetry::Instrumentation::Grpc.client_interceptor [#1](https://github.com/hibachrach/opentelemetry-instrumentation-grpc/pull/1)
+
+## [0.1.2] - 2024-06-26
+
+- Align span naming with spec
+
+## [0.1.1] - 2024-06-26
+
+- Fix `uninitialized constant Interceptors` error
+
+## [0.1.0] - 2024-06-18
+
+- Initial release

instrumentation/grpc/CODE_OF_CONDUCT.md

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+# Contributor Covenant Code of Conduct
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+All community leaders are obligated to respect the privacy and security of the reporter of any incident.
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+## Enforcement Guidelines
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instrumentation/grpc/Gemfile

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+# frozen_string_literal: true
+
+# Copyright The OpenTelemetry Authors
+#
+# SPDX-License-Identifier: Apache-2.0
+
+source "https://rubygems.org"
+
+# Specify your gem's dependencies in opentelemetry-instrumentation-grpc.gemspec
+gemspec
+
+gem "rake", "~> 13.0"
+gem "rspec", "~> 3.0"
+gem "standard", "~> 1.3"
+gem "opentelemetry-sdk", "~> 1.0"
+gem "opentelemetry-test-helpers"
+gem "grpc"

instrumentation/grpc/LICENSE

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