feat: initial implementation

[phisco]

Description of your changes

From crossplane/crossplane#7025.

Fixes #

I have:

• Read and followed Crossplane's contribution process.
• Added or updated unit tests for my change.

[Copilot]

Pull request overview

This PR introduces a reference implementation of a Pipeline Inspector sidecar for Crossplane that captures function pipeline execution data (requests and responses) and logs them to stdout.

Changes:

• Implements a gRPC server that listens on a Unix socket and logs pipeline inspection events
• Supports both JSON and human-readable text output formats
• Includes comprehensive test coverage for the inspector functionality

Reviewed changes

Copilot reviewed 6 out of 7 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
main.go	Entry point with CLI parsing, gRPC server setup, and graceful shutdown handling
server/server.go	Core Inspector implementation with JSON and text formatters
server/server_test.go	Comprehensive unit tests for Inspector functionality
go.mod	Module definition with dependencies
go.sum	Dependency checksums
Dockerfile	Multi-stage build using distroless base image
README.md	Documentation with usage examples and configuration options

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