feat: add customize tracer in extract func and add gomodule

[codjust]

two feature：
1、add go module support，can use git tag to control version.
2、add ExtractWithTracer func, support customize tracer object, not just use global tracer

[Copilot]

Pull Request Overview

This PR adds support for custom tracer extraction and Go module support.

• Added a new function, ExtractWithTracer, that accepts a custom tracer rather than relying solely on the global tracer.
• Modified import statements to support Go modules.

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
amqptracer/tracer.go	Added a custom ExtractWithTracer function and related comments.
amqptracer/tracer_test.go	Added tests for the new ExtractWithTracer function.

[Copilot]

The type assertion on ctx may panic if the assertion fails. Consider using the comma-ok idiom (e.g., spanCtx, ok := ctx.(testSpanContext)) and failing the test with a clear message if the assertion does not succeed.

Suggested change

	if ctx.(testSpanContext).FakeID != 42 {
	spanCtx, ok := ctx.(testSpanContext)
	if !ok {
	t.Fatalf("Expected testSpanContext, got %T", ctx)
	}
	if spanCtx.FakeID != 42 {