add new github.com/labstack/echo-contrib/otelecho/v5 sub-module

[vadimi]

This version performs the same instrumentation as previously available otelecho in opentelemetry-go-contrib repo, but with echo v5 support

v5 sub-directory is used specifically in case of new v6, v7, etc versions of echo come out in the future

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 67.69%. Comparing base (1e69e54) to head (f3a0cc8).
⚠️ Report is 8 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #141      +/-   ##
==========================================
+ Coverage   63.77%   67.69%   +3.91%     
==========================================
  Files           9        9              
  Lines         969      585     -384     
==========================================
- Hits          618      396     -222     
+ Misses        308      157     -151     
+ Partials       43       32      -11     

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[aldas]

Just a quick heads-up that I will be reviewing this over the weekend.

[mojixcoder]

Thanks, this PR is heavily needed and is our only blocker to upgrade to v5.
Moving this package to echo-contrib has a little difference with the otelecho one which is addressed in #143 .
But I think it's out of scope of this PR.