Add benchmark script

* Structure `cli` crate as both a library and an executable, so that
benchmarks can import code from the crate.
* Import macros in the Rust 2018 style.

cli/src/generate/build_tables/minimize_parse_table.rs

@@ -4,6 +4,7 @@ use crate::generate::grammars::{LexicalGrammar, SyntaxGrammar, VariableType};
 use crate::generate::rules::{AliasMap, Symbol};
 use crate::generate::tables::{ParseAction, ParseState, ParseTable, ParseTableEntry};
 use hashbrown::{HashMap, HashSet};
+use log::info;
 
 pub(crate) fn minimize_parse_table(
     parse_table: &mut ParseTable,