Feat: add timeout

[parthpnx]

Overview

Adding a timeout to skprmail avoidingfor unnecessarily long wait times with no errors or closures

Implementation

There was a context created and passed to both the ses and the default method. The ses method automatically handles the timeout via the context whereas we've implemented a goroutine to check for context timeout and close the application.

How to Test

Setup a mail server using smtp-go (https://github.com/emersion/go-smtp/blob/master/cmd/smtp-debug-server/main.go) package and add sleep at /server.go:211 This will ensure that the smtp server is available but will not respond to a connection dial leading our skprmail to be hung until the timeout is hit.

What is the rollout plan?

Merge and rollout

Does this change need a blog post?

Maybe a blog pose around contexts and timeouts

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