Allow to have some markup to commit's comments (BB-7136)

I realized some time ago that commit's comments can only contain links to issues and similars but nothing like bold/italics/bullet lists\inline code.

I think it could be useful to (optionally?)allow (some)Markdown on them. For example a commit message like:

#!plaintext


Improved class ``SomeClass`` and fixed issue BCLOUD-53:

  -  The ``this_method`` method now <something>
  -  The class provides a new invariant ...
  -  Refactored ``big_method``s code into two submethods ``submethod_a``, ``submethod_b``. 

Would be rendered:

Improved class SomeClass and fixed issue BCLOUD-53:

• The this_method method now <something>
• The class provides a new invariant ...
• Refactored big_method}}s code into two submethods {{submethod_a, submethod_b.

Is there a reason for not providing this feature?

Obviously I'm not saying to add markup to be rendered everywhere(e.g. in bitbucket's home where you see only the summaries of the commits), but in the deatiled view I think it would be simply fine to have.