Grammar cannot read git trailers

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<footer>          ::= <token>, <separator>, <whitespace>*, <value>
/* "!" should be added to the AST as a <breaking-change> node with the value "!" */
<token>           ::= <breaking-change>
                   |  <type>, "(" <scope> ")", ["!"]
                   |  <type>, ["!"]
<separator>       ::= ":" | " #"
<value>           ::= <text>, <continuation>+
                   |  <text>
<continuation>    ::= <newline>, <whitespace>+, <text>

with https://git-scm.com/docs/git-interpret-trailers

• "When reading trailers, there can be whitespaces after the token, the separator and the value"
• "There can also be whitespaces inside the token and the value"
  • This one seems like it makes parsing trailers a lot harder and doesn't seem common