Carol Channing and Sid Caesar in 1971's "Four on a Garden" (Photo by Martha Swope).November 18, 2024: Theatre Yesterday and Today, By Ron Fassler There used to be a certain subset of actor expert in comedy, or boulevard comedy as it was once called. They were indispensable in what is now a bygone era of Broadway. Coined by the French as comedie de boulevard (or a comedy of the street), it generally translates a…