Tracing - Installation and implementation

• Introducing OpenTelemetry to Go
• Introducing OpenTelemetry to Node.js
• Sending traces from PHP applications to Mackerel
• Sending traces from Python applications to Mackerel
• Sending traces from Ruby applications to Mackerel
• Sending traces from .NET applications to Mackerel
• Sending traces from Java applications to Mackerel
• Introducing OpenTelemetry to other languages
• Introducing OpenTelemetry Collector
• Introducing OpenTelemetry to Browser