Simplify the IMail interface

[Jericho]

Several methods currently on the IMail interface are what I call "convenience" methods: they address common scenarios like sending the same email to multiple recipients, sending a single email without using a template, sending a single email using a legacy template, sending a single email using a dynamic template, etc. and behind the scene they simply invoke the IMail.SendAsync method with the appropriate parameters for the given scenario.

These methods should be implemented as extension methods and only the SendAsync method should be on the IMail interface.

[Jericho]

🎉 This issue has been resolved in version 0.80.0 🎉

The release is available on:

• GitHub Release
• NuGet Package

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