build: exclude src/examples from published dist

Examples are meant to be read and run from the repo via tsx, not
imported from the package. Excluding them from the prod/cjs build
configs means dist/{esm,cjs}/examples/ is no longer produced and
no longer ships in the npm tarball.

Follow-up to #1579 / #1553.

Author: pcarleton

tsconfig.cjs.json

@@ -6,5 +6,5 @@
         "outDir": "./dist/cjs"
     },
     "include": ["src/**/*"],
-    "exclude": ["**/*.test.ts", "src/__mocks__/**/*", "src/__fixtures__/**/*"]
+    "exclude": ["**/*.test.ts", "src/__mocks__/**/*", "src/__fixtures__/**/*", "src/examples/**/*"]
 }

tsconfig.prod.json

@@ -4,5 +4,5 @@
         "outDir": "./dist/esm"
     },
     "include": ["src/**/*"],
-    "exclude": ["**/*.test.ts", "src/__mocks__/**/*", "src/__fixtures__/**/*"]
+    "exclude": ["**/*.test.ts", "src/__mocks__/**/*", "src/__fixtures__/**/*", "src/examples/**/*"]
 }