Ignore types on check

[bentheiii]

Description

closes #617 Adds a new optional key to newsfragment categories called check (boolean, defaults to true). If set to false, towncrier check will not consider newsfragments of this category as enough to pass

Checklist

• [X] Make sure changes are covered by existing or new tests.
• [X] For at least one Python version, make sure local test run is green.
• [X] Create a file in src/towncrier/newsfragments/. Describe your change and include important information. Your change will be included in the public release notes.
• [x] Make sure all GitHub Actions checks are green (they are automatically checking all of the above).
• [X] Ensure docs/tutorial.rst is still up-to-date.
• [X] If you add new CLI arguments (or change the meaning of existing ones), make sure docs/cli.rst reflects those changes.
• [X] If you add new configuration options (or change the meaning of existing ones), make sure docs/configuration.rst reflects those changes.

[bentheiii]

Hi @adiroiban, can we merge this?