Add Microsoft Teams notifications

[MIsmail80]

Fixes #222

This adds supporting of Microsoft Teams notifications. Ex:

@finished
    @teams('teams-webhook', 'message = null', 'theme = 'success'', 'options = []')
@endfinished

Parameters Description:

teams-webhook: Required.
You should create an incoming webhook for the selected channel to receive notifications, check Teams incoming webhooks docs for more information.

message: Optional.
Default value is Envoy default message, but you can overwrite it with your custom message.

theme: Optional.
Default value is success for green color, but you can choose from three additional theme:

• info for cyan color
• error for red color
• warning for orange color

options: Optional.
Teams API has many other attributes to customize your message box like title, summary, and sections...
You can use this options param. as an array to pass additional attributes to Teams API.

[driesvints]

Maybe we should rename this (and all other references) to MicrosoftTeams? I realize "Teams" is the app name but it's so generic that it could be confusing.

[MIsmail80]

I agree with you, I'll working on this.

[driesvints]

@MIsmail80 I've converted the PR to draft until you've made these changes. Feel free to mark it as ready again when you've done the changes.

[usmanjdn93]

@taylorotwell @driesvints can any one add this to the docs please...notification