v1.42.0

• Add support for custom lint and breaking change plugins. See our launch blog post for more details!
• Add buf dep graph --format flag that defaults to dot, and adds the option json, to print the dependency graph in JSON format.
• Fix bugs in buf format where trailing comments on commas in message literals were not properly propagated to the formatted proto, empty message literals were not properly indented, and compound strings in options added an extra newline before trailing commas.