support github.com/labstack/echo/v5

[vadimi]

This PR is based on #8434, but as stated in comments there are breaking changes in echo/v5 and it also requires go 1.25, so creating go.opentelemetry.io/contrib/instrumentation/github.com/labstack/echo/v5/otelecho to make sure echo/v4 instrumentation still works.

[linux-foundation-easycla]

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• ✅ login: vadimi / name: Vadim (4ff292b)

[flc1125]

Thank you for your contribution. It is a duplicate of #8434. Considering the principle of priority, we will use the other PR as the baseline, unless no one follows up on that one.

[dmathieu]

As this PR does it "the right way" (with a new component) contrarily to the other one, I'd be tempted to take this one as canonical.

This brings the question of new components.
Why should this new component be in this repo? Could it be in a repo owned by echo?
Will you be listed as a codeowner for this repository (with all that entitles, as documented in the contributing document)?

[vadimi]

Why should this new component be in this repo? Could it be in a repo owned by echo?

I've asked echo maintainer if it would makes sense to add the new otel package to one of the echo repos (labstack/echo-contrib#135)