default boolean allowsChildren() {
    return true;
  }
Get whether this tag allows children.

<p>If children are not allowed, this tag will be auto-closing, and
should not be closed explicitly. In strict mode, a closing tag will be
an error. In lenient mode, the closing tag will be interpreted as literal text.</p>

@return whether this tag will allow following to become children
@since 4.10.0
text-minimessage/src/main/java/net/kyori/adventure/text/minimessage/tag/Inserting.java