Ability to set different fragment types

[OnceUponALoop]

In our use-case we found it helpful to extend the existing categories (to match our conventional commit categories) and support multiple fragment extensions for each category.

This was accomplished from the outside by adding the logic to the jinja template (macro abuse) rather than modifying towncrier source.
I'm wondering if this is a common enough use-case that it would be worth extending to cover in towncrier directly.

Example

Type	Extension(s)
🚀 Feature	.feat, .feature
🐞 Bug	.bug, .bugfix, .fix
✔️ Minor Changes	.minor, .refactor
🌀 Miscellaneous	.misc, .chore

towncrier.toml snippet

# ┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
# ┃                           🏷️ Category Definitions                           ┃
# ┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛

# ─── 🚀 Features ───────────────────────────────────────────────────────────────
#
# Fragment: [ feat | feature ]

[[tool.towncrier.type]]
name="🚀 Features"
directory="feat"
showcontent=true

[[tool.towncrier.type]]
name="🚀 Features"
directory="feature"
showcontent=true

# ─── 🐞 Bugfixes ───────────────────────────────────────────────────────────────
#
# Fragment: [ fix | bugfix | bug ]

[[tool.towncrier.type]]
name="🐞 Bugfixes"
directory="bugfix"
showcontent=true

[[tool.towncrier.type]]
name="🐞 Bugfixes"
directory="fix"
showcontent=true

[[tool.towncrier.type]]
name="🐞 Bugfixes"
directory="bug"
showcontent=true

[adiroiban]

Thanks for the suggestion.

In my case, is not common... but I guess that it can help a lot with open source projects, where contributors are used with all kind of extensions

I would pretty much love to get rid of the "directory" config

maybe something like this

[tool.towncrier.type]]
name="🐞 Bugfixes"
-directory="bugfix"
+extension=["bugfix", "bug", "fix"]
showcontent=true

but also allow simple config via

[tool.towncrier.type]]
name="🐞 Bugfixes"
-directory="bugfix"
+extension="bugfix"
showcontent=true