v1.0.0

What's Changed

• Drop all third-party deps, removing the need to keep them updated
• Bump required Go version to 1.22 to pick up language features we now use
• Update golangci-lint and go-test workflows to use current github actions
• Add Search benchmarks
• Update README with more detail

Being feature complete for its limited functionality, 100% test coverage implying a low bug count, and now no dependencies, I'm considering this done enough to slap a v1 on it, and don't expect to update it very often.