feat: add breaking change section

[SMoraisAnsys]

Adds checking for breaking change in the PR title and body. On repos following conventionnal commits, this will greatly help:

• users to know what breaking changes are introduced in a specific version;
• developers to have an idea of how often they are breaking their API.

I think that this could be used as a metric to know whether a repo is ready to move to version 1.0.0

Close #722

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[RobPasMue]

Hmmm... Weren't breaking changes done as feat!:...

Can't access easily the conventional commits site (security issue apparently) but see https://gist.github.com/qoomon/5dfcdf8eec66a051ecd85625518cfd13#breaking-changes-indicator

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EDIT - just saw that you are handling this case too... I overlooked it, sorry!

[RobPasMue]

What's the status here @SMoraisAnsys? I think @jorgepiloto is planning on doing the release tomorrow or Wednesday latest.