Add ability to set the logger on echo.Context

[Cyberax]

Issue Description

Please, add ability to set the logger (from middleware) on a per-request basis. There is already echo.GetLogger() method but no echo.SetLogger()

I have implemented it in: #1377

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[Cyberax]

Ping?

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.