feat: support commit body in breaking changes section

[vad1ym]

Closes #112

Add a new boolean configuration property breakingChangesIncludeBody to allow using the BREAKING CHANGE: text instead of the commit title to generate the Breaking Changes section.

Commit example

feat: add some breaking changes

BREAKING CHANGE: Here will be short info on how to migrate

Current behaviour

Currently, the Breaking Changes section contains duplicate entries that don’t make sense. Ideally, it should display the BREAKING CHANGE: message from the commit body.

## v0.10.2...next

[compare changes](https://github.com/.../v0.10.2...next)

### 🚀 Enhancements

- ⚠️  Add some breaking changes ([...](https://github.com/.../commit/...))

#### ⚠️ Breaking Changes

- ⚠️  Add some breaking changes ([...](https://github.com/.../commit/...))

### ❤️ Contributors

- Vadym Bulakh ([@vad1ym](https://github.com/vad1ym))

Desired behaviour

The Breaking Changes section should display the BREAKING CHANGE: commit description instead of duplicating the commit title.

## v0.10.2...next

[compare changes](https://github.com/.../v0.10.2...next)

### 🚀 Enhancements

- ⚠️  Add some breaking changes ([...](https://github.com/.../commit/...))

#### ⚠️ Breaking Changes

- Here will be short info on how to migrate

### ❤️ Contributors

- Vadym Bulakh ([@vad1ym](https://github.com/vad1ym))